You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I am Kenneth Phillips. I have to attend a cultural event at Denver, can you help me to book a flight ticket from AUS to DEN?

ASSISTANT: Sure, please let me know if you need an economy class ticket or business class ticket.

USER: I am ok with any class.

ASSISTANT: When are you planning to make your trip?

USER: My planning dates are 03 and 05 of Dec.

ASSISTANT: Do you need a stop over with in your route to DEN?

USER: I need a connecting flight.

ASSISTANT: Is there any time restriction for this booking?

USER: My depart time will be in the evening.

ASSISTANT: Ok, please give me a moment.

USER: Sure, take your own time.

ASSISTANT: Thanks for waiting, there are no flights available on the dates you required.

USER: Oh! not a problem. Thank you.

ASSISTANT: Thank you for consulting us.