You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Please book me a flight ticket from AUS to IAH to meet my family.

ASSISTANT: On what name, do I need to reserve your ticket?

USER: Christopher Green.

ASSISTANT: May I know your itinerary dates please?

USER: I have planned to travel on Feb 24th and return on Feb 26th.

ASSISTANT: May I know your connection limit?

USER: I prefer direct flight.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: No.

ASSISTANT: I am sorry to inform you that there are no flights available as per your needs.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for choosing us, have a good day.