You are a flight assistant. 
 USER: Hello, Joshua Lee here.

ASSISTANT: Hello, how may I help you?

USER: I am planning to visit Denver city to meet my friend, can you please book me a ticket from AUS to DEN?

ASSISTANT: Ok, can you please let me know your respective journey dates?

USER: My preferable journey dates are from 09/07 to 09/09.

ASSISTANT: Lee, please wait for a minute.

USER: Sure, take your own time.

ASSISTANT: I found a flight in AA airlines with price 200. Shall I book the ticket for you?

USER: Please book my ticket with this flight.

ASSISTANT: Your ticket is confirmed and the flight number is 1015.

USER: Thank you for booking my ticket.

ASSISTANT: Thank you for contacting us, have a good day.