You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: David Harris here. Can you please help me in booking the ticket from LAX to LAS?

ASSISTANT: Sure, when are you willing to travel?

USER: My journey dates are 09/22 and ends on 09/24.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

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

USER: That's ok, thank you for giving the information anyways.

ASSISTANT: Thank you for opting us.