You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Dennis Young.

ASSISTANT: How can I help you?

USER: Can you find a direct flight for me in the evening from my departure?

ASSISTANT: Ok, may I know your airport codes please?

USER: Ok, my airport codes are from LAS to HOU.

ASSISTANT: Your travelling dates please?

USER: Sure, my travelling dates are from Mar 24 to 26.

ASSISTANT: I am sorry no flights found on your route.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for choosing us.