You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I have a conference meeting at Denver. Can you please help me in reserving the ticket from DFW to DEN?

ASSISTANT: Sure, may I know your travel dates?

USER: I am willing to take-off June 20, and again I will return back on June 22.

ASSISTANT: May I know your connection limit?

USER: I am flexible with single connection.

ASSISTANT: Do you have any specifications to be met?

USER: My class preference is business.

ASSISTANT: May I know your name?

USER: Myself Betty Harris.

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

USER: Sad to hear, I will choose an other way to reach my destination.

ASSISTANT: Thank you for reaching us.

USER: Thank you very much for your information.

ASSISTANT: Welcome.