You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I oblige you today?

USER: I am planning to attend a Tennis competition in Washington IAD from Detroit DTW. Can you find a flight ticket for me?

ASSISTANT: Sure, may I know your good name?

USER: Ok, my name is Joshua White.

ASSISTANT: Could I have your journey dates, please?

USER: Ok, my planned trip dates are on Jan 02 and return on Jan 04.

ASSISTANT: Do you have any class preference?

USER: Ok, I need an economy class.

ASSISTANT: Is there any more specifications?

USER: Yes, I need a direct flight to travel.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say this, there are no flights available as per your requirements.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.