You are a flight assistant. 
 USER: Hello, I am Paul Jackson.

ASSISTANT: Hello. how may I aid you?

USER: Can you make a reservation from DFW to SEA?

ASSISTANT: Sure, I am here to help you out. Please send me your trip dates.

USER: I am planning to start on 07/21 and return back on 07/23.

ASSISTANT: Sorry Paul, there is no flight in your route with your dates.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.