You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am planning to attend my cousin marriage at Denver. Can you please help me in reserving the ticket from AUS to DEN?

ASSISTANT: Sure, I will help you. Can you please share me your travelling dates?

USER: I am planning my trip on May 6 and again I will return back on May 8.

ASSISTANT: Ok, do you have any connection limit?

USER: No, I don't have any connection limit's.

ASSISTANT: Ok, may I know your arrival and departure time?

USER: I am comfort with any time to depart and return.

ASSISTANT: Ok, please mention your name.

USER: Myself Gary Campbell.

ASSISTANT: Do you prefer any class?

USER: My class preference is business.

ASSISTANT: As per your requirement, no flights are available on your route.

USER: Not a big problem, anyhow thank you very much for your service.

ASSISTANT: Welcome, have a nice day. Thank you for choosing us.