You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Please book a flight ticket to Houston to meet my cousin.

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: Sure, my airport codes are AUS to IAH.

ASSISTANT: Can you please let me know your travel dates?

USER: My travelling dates are March 05 and 07.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Do you prefer either direct flight or connecting flight?

USER: I prefer to travel in a connected flight.

ASSISTANT: Do you have any other specifications?

USER: My depart time is morning.

ASSISTANT: May I know your name to proceed further?

USER: Sure, my name is David Garcia.

ASSISTANT: Thank you for providing your details, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry, there were no flights found from AUS to reach IAH.

USER: Ok, thanks for your assistance.

ASSISTANT: Thank you for approaching us.