You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Elizabeth Taylor. Can you please book a flight ticket from DFW to AUS?

ASSISTANT: Sure, I will aid you in booking your flight ticket. Can you please let me know your travel dates?

USER: Sure, I need to travel on date of 09/02 and 09/04.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry to say you that there is no flight available on your preferred dates.

USER: Oh! It is sad to hear. I need to go with another mode of transportation this time. Anyway, thank you for your time.

ASSISTANT: You are welcome, have a nice day.