You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Jack Phillips. Can you please help me in booking my flight ticket from LAX to LAS?

ASSISTANT: Sure, can I know the travel dates please?

USER: My travelling dates are 02/18 and 02/20.

ASSISTANT: Sorry, I flight found on your preferable dates. No flight.

USER: Ok, no problem. Thank you for your service.

ASSISTANT: Thank you for reaching us.