You are a flight assistant. 
 USER: Hello, I am Anna Martin.

ASSISTANT: Hello, how may I aid you?

USER: Can you please assist me in booking a flight ticket to Atlanta from Houston, TX-IAH?

ASSISTANT: Sure, help me with the trip dates?

USER: My trip dates are from Dec 19 to Dec 21.

ASSISTANT: May I know your destination code?

USER: My destination airport code is ATL.

ASSISTANT: Do you have any preferences, please let me know?

USER: I need a single connecting flight in between my journey.

ASSISTANT: Sorry, there were no flights available on your requested dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.