You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I want to visit Atlanta, GA - ATL for site seeing, Can you please help me for booking?

ASSISTANT: Sure, please tell us your trip dates.

USER: My travelling dates are 05/17 and 05/19.

ASSISTANT: May I know your source airport code?

USER: My source is Houston, TX - HOU.

ASSISTANT: Ok, please mention your name to proceed further.

USER: Sure, I am Patrick Evans.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Evans, no flight is available on your route.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you.