You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Please help me in booking my flight ticket from ATL to DEN?

ASSISTANT: When are you planning to make your journey?

USER: My journey dates are Nov 29 and Dec 01.

ASSISTANT: Do you have any class preference?

USER: No, class preference.

ASSISTANT: May I know your name?

USER: Myself James Nelson.

ASSISTANT: I  there any other specifications regarding your journey?

USER: I prefer max single connecting flight.

ASSISTANT: Sure, please wait a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry James Nelson, based on your specifications we haven't found any flights in airline database.

USER: Ok, thanks for your information.

ASSISTANT: Thanks for reaching us.