You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Thomas Hill here. I would like to book a ticket from JFK to SFO, can you please help me with that?

ASSISTANT: Ok, may I know your travel dates too?

USER: The travel dates are from 03/11 to 03/13.

ASSISTANT: There is no flight available on your route to book your ticket.

USER: That's ok, thank you for your help.

ASSISTANT: Thanks for contacting us.