You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am planning to visit New York, NY-EWR. Can you please help me for booking the flight ticket from Los Angeles?

ASSISTANT: Sure, I am here to help you. Could you please provide me with your dates of journey?

USER: Thank you, the travelling dates are 02/20 to 02/22.

ASSISTANT: Ok, may I know your source airport code please?

USER: The source airport code is from CA-LAX.

ASSISTANT: May I know your name please?

USER: Sure, my name is Amanda Collins.

ASSISTANT: Sorry Amanda, there is no flight found as per your travelling details.

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

ASSISTANT: Thank you for your appreciable service.