You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Debra Lewis. I would like to book a ticket from BOS to SEA, can you help me?

ASSISTANT: On which dates you are willing to travel?

USER: My travel dates are 04/16 and 04/18.

ASSISTANT: Sorry, there is no flights available.

USER: No problem, thanks for checking.

ASSISTANT: Most welcome.