You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Here Jacob Clark and I have to travel DTW on 02/29, can you book a flight ticket for me?

ASSISTANT: Sure, I will help you in booking the ticket.

USER: Thank you.

ASSISTANT: May I know your source airport code please?

USER: I would like to start my trip from DEN which is nearest to me.

ASSISTANT: Can I know your return date please?

USER: I will return back on 03/02 and find a direct flight in my journey.

ASSISTANT: Ok, please hold on for a while.

USER: Sure.

ASSISTANT: Sorry, there are no flights found in our database according to your specifications.

USER: Ok, no problem with that one, thank you for your assistance.

ASSISTANT: Thank you for choosing us.

USER: Welcome.