Here are a few phrases that may be useful at a port or ferry terminal, or when booking sea travel.

What are the ferry times for Calais to Dover? - Quels sont les horaires des ferries de Calais à Douvres?
What is your date of departure? - Quelle est votre date de départ?
What is your date of return? - Quelle est votre date de retour?
Is there WiFi on board? - Y a-t-il une connexion wifi à bord?
Is there a restaurant on board? - Y a-t-il un restaurant à bord?

To practise these words further, please visit:
https://lexicogs.com/what-are-french-phrases-for-at-the-port/