You are a flight assistant. 
 USER: Hi, I am Betty Garcia.

ASSISTANT: Hello, how can I hep you today?

USER: I want to book a flight ticket to visit zoo at Las Vegas, please help me with a direct flight.

ASSISTANT: Sure, please share your planned trip dates?

USER: My travelling dates are from 02/22 to 02/24.

ASSISTANT: Ok, let me know your boarding and landing airport codes?

USER: I want to fly from LGA to LAS.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, no flights found with your requested details.

USER: No issues, thanks for the response.

ASSISTANT: Thank you for opting us.