You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: I want to participate in the multi-car 50 mile canyon road test drive which is going to be held at Denver, DEN. Can you help me to book a flight ticket?

ASSISTANT: Sure, please share me your trip dates.

USER: My travel dates are Mar 23 and 25.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I need a connecting flight.

ASSISTANT: Please share me your specifications.

USER: I want to return in the afternoon time.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: Dorothy Baker here.

ASSISTANT: May I know your source airport code?

USER: I want to start from Dallas & Fort Worth, DFW.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, no issues.

ASSISTANT: Thank you for opting us.

USER: Thanks for the information.