You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to celebrate Christmas with my family at Las Vegas, can you please book a flight ticket?

ASSISTANT: Sure, may I know your journey dates?

USER: My journey dates are from 12/24 to 12/26.

ASSISTANT: Please provide your airport codes.

USER: My airport codes are from New York, NY-EWR to Las Vegas, NV-LAS.

ASSISTANT: To proceed further may I know your good name?

USER: I am Anthony Moore.

ASSISTANT: We are very sorry to notify you that there is no flights found based in your details.

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

ASSISTANT: Thanks for approaching us.