You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jessica Garcia.

ASSISTANT: How can I assist you for the day?

USER: Can you please book a flight ticket from HOU to LAS, I have a meeting in LAS.

ASSISTANT: Jessica Garcia, can I know your travel dates?

USER: My travelling dates are 09/20 and 09/22.

ASSISTANT: Let me check for the flights.

USER: Ok.

ASSISTANT: Sorry to inform you about the availability, no flights were found for your requirements. Thanks for choosing us.

USER: It's ok.

ASSISTANT: Have a great day.

USER: Thank you for your information.