You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

USER: I am Helen Wilson from Austin. I need a direct flight to attend a client meeting in Houston, can you help me in booking a flight ticket?

ASSISTANT: Sure, we are glad to help you. Can you please help me with providing your airport codes?

USER: My source and destination airport codes are TX - AUS, TX - HOU.

ASSISTANT: May I know on what dates that you prefer to travel?

USER: My departure day is 03/08, return day is 03/10.

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

USER: Sure.

ASSISTANT: Sorry we did not find any flights matching your credentials.

USER: Not an issue, thank you.

ASSISTANT: Thank you for approaching us, have a good day.