You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Benjamin Jackson.

ASSISTANT: Jackson, how may I help you?

USER: I am planning to book a ticket from OAK to DFW. Can you please help me out?

ASSISTANT: Sure, please provide your trip dates.

USER: I would like to travel on 01/04 and return back 01/06.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no flight is available on your route.

USER: That's fine. Thank you for your service.

ASSISTANT: Thank you for contacting us.