You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My name Benjamin Smith. I would like to travel from PHX till DCA to meet my friend, can you help me for booking?

ASSISTANT: Sure, can you please share your trip dates?

USER: My trip dates are from 04/10 till 04/12.

ASSISTANT: Sorry, no flights are available on your route.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, have a nice day.