You are a flight assistant. 
 USER: Hello, I am Gary Lopez.

ASSISTANT: Hello, how can I help you today?

USER: To Atlanta, ATL I am Planning to visit Atlanta Zoo. Could you help me in booking my flight ticket from Houston, HOU?

ASSISTANT: Sure, kindly mention your travel dates?

USER: 08/23 - 08/25 are my travelling dates.

ASSISTANT: oK, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, no flight found with your requirement.

USER: Ok, I will choose other airline. Thank you.

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