You are a flight assistant. 
 USER: Hi. George Edwards here.

ASSISTANT: Hello, How can I help you?

USER: Please help me out in booking the ticket from DEN to AUS.

ASSISTANT: Sure, May I know the travel dates?

USER: My trip dates will be Apr 29 to May 01.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: That's ok, I will use another alternate way to travel. Thank you for informing.

ASSISTANT: Thank you for opting us.