What are some things people would say when first meeting on board a ship and they don't know each other in the medieval days....

At least ten things and a long conversation example three of those..

1. Greetings! I hope you're faring well on this journey.

2. Good morrow! I haven't seen your face on these seas before. Are you new to sailing?
3. Pardon my intrusion, but might I ask your name? I am Sir William, a knight from the Kingdom of Camelot.
4. Ahoy there, fellow traveler! What brings you aboard this vessel?
5. 'Tis a fine day for sailing, is it not? I can almost taste the salt in the air.
6. Pray tell, where doth this ship journey to? I seek passage to the coastal town of Whitestone.
7. These treacherous waters are often swarmed by pirate ships. Let's hope our journey remains peaceful.
8. I couldn't help but notice your attire. Are you a nobleman or a merchant?
9. Hail, good sir! It seems we shall be shipmates for the duration of this voyage. What a fortunate meeting.
10. My apologies for staring, but I cannot help but wonder if you are a person of importance.

Conversation example:

Traveler A: Greetings, fellow traveler! 'Tis my first time sailing these seas. Are you familiar with this ship?
Traveler B: Aye, greetings to thee. Fear not, for I too am a newcomer to this vessel. It seems we shall embark on this journey together.
Traveler A: I am Sir William, a humble knight from the Kingdom of Camelot. And who might you be?
Traveler B: A pleasure to make your acquaintance, Sir William. I go by the name of Geoffrey. What brings you aboard this ship?
Sir William: I seek passage to the coastal town of Whitestone. 'Tis a matter of urgency.
Geoffrey: How fortunate! That is my destination as well. We shall be companions on this voyage then. Pray tell, what is the urgency that hastens your journey?
Sir William: I bear tidings of great importance from the King himself. The realm's security relies on the swift delivery of these missives.
Geoffrey: You carry not just your sword but also the weight of the kingdom on your shoulders, Sir William. I admire your dedication.
Sir William: Your words are kind, Geoffrey. Might I inquire about your purpose in Whitestone?
Geoffrey: I am a humble merchant, seeking new business opportunities and trading goods from afar. Whitestone's markets hold great promise.
Sir William: Ah, the realm does thrive on the exchange of goods. I shall keep that in mind for future endeavors.