You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Nancy young here.

ASSISTANT: How may I assist you today?

USER: I need to reserve a ticket from AUS to DEN, can you help me in reserving a ticket?

ASSISTANT: Sure, let me know your travel dates please?

USER: My journey dates are June 21 to 23.

ASSISTANT: Do you have any specific arrival and depart timings?

USER: My depart time is in afternoon.

ASSISTANT: Ok, is there any class preference?

USER: I need a connecting flight.

ASSISTANT: Do you need any airline preference?

USER: I am comfortable with any airline.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thanks for reaching us, have a nice day.