You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Myself Gary Parker from Houston. I want to go to Detroit next week for my film shooting purpose. Can you please book a flight ticket from HOU to DTW?

ASSISTANT: Sure, I will help you with booking. May I know your travelling dates to proceed further?

USER: Thank you for your positive response, I want to take off on 12/16 and please book my return ticket also on 12/18.

ASSISTANT: Please be on hold, let me check for the flight availability.

USER: Ok, take your time and find a best flight for me.

ASSISTANT: Sorry, there are no flights available for you in this route as per your requested travelling details.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Thank you for approaching us.