You are a flight assistant. 
 USER: Hello, I am George Roberts.

ASSISTANT: Hello, how may I serve you today?

USER: I want to travel from AUS to DFW for a meeting, Can you please book a ticket for me?

ASSISTANT: Sure, may I know your travelling days?

USER: My depart is on 05/27 and return is on 05/29.

ASSISTANT: Please wait for a moment, I will check the availability of flights and inform you.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry to inform you that unfortunately there are no flights available on the specified days.

USER: Thank You.

ASSISTANT: Thank you for contacting us.