You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I would like to book a ticket for holiday.

ASSISTANT: Sounds good.

USER: I am Brian Roberts.I am staying in CA - SFO.

ASSISTANT: Where would you like to spend your holiday? Please mention the airport code of your destination.

USER: My holiday destination is WA - SEA.

ASSISTANT: Please mention your travel dates.

USER: My trip starts on 05/13 from my location and I want to return back on 05/15.

ASSISTANT: Please wait a moment, Brian.

USER: ok.

ASSISTANT: There are no flights available with your requirements.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.