You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: How may I help you today? I would like to book a ticket from SEA to PHL. Can you please help me out?

ASSISTANT: Ok, may I know your trip dates to go?

USER: I would like to travel on 09/06 and return back on 09/08.

ASSISTANT: Ok, wait a moment.

USER: Sure, I will wait.

ASSISTANT: Thanks for your time, there is no flight for you.

USER: That's fine.

ASSISTANT: Ok, may I know your name for the documentation purpose?

USER: I am Nicholas Young. Thank you for your service.

ASSISTANT: Thanks for contacting us.