You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need to book a ticket from AUS to DEN, can you please help me out in reserving a flight ticket?

ASSISTANT: Sure, may I know your airline preferences?

USER: I am comfortable to travel in normal cost airline.

ASSISTANT: Sure, can I know your travelling dates to search for the flight?

USER: Please search the flight on Dec 29 and return on Dec 31.

ASSISTANT: Are you fine with connecting flight?

USER: Yes, I am fine with connecting flight.

ASSISTANT: Sorry to say, no flight is available for you as per your requests. Can I have your name?

USER: I am Amy Allen. Ok, I will try with alternative.

ASSISTANT: Thank you for reaching us.

USER: Thank you.