You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be there for you?

USER: Can you please make a reservation with direct flight to attend  a meeting in Washington?

ASSISTANT: Sure, when are you planning to make your trip?

USER: My journey dates are on May 25th and 27th.

ASSISTANT: Will you please provide me your airport codes?

USER: My airport codes are, DFW to DCA.

ASSISTANT: Do you need an economy class or business class?

USER: I am ok with any class.

ASSISTANT: May I know your name?

USER: Sure, I am Dennis Baker.

ASSISTANT: Thanks for providing your credentials Dennis Baker, we regret to inform that there are no flights going on your way at this moment.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.