You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: As I am a singer, I want to attend Music Festival in Las Vegas, NV - LAS. Can you book a ticket on 08/05?

ASSISTANT: Sure, do you have any price limit?

USER: I can afford up to 1000.

ASSISTANT: When would you like to return?

USER: I intend to return on 08/07.

ASSISTANT: Where do you want to start your journey from?

USER: My source is New York, NY - LGA.

ASSISTANT: May I know your name?

USER: Sure, I am Gregory Harris.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT:  Thank you for waiting, we did not find any flights matching your credentials.

USER: No problem, Thank you for your service.

ASSISTANT: Thank you for reaching us. Hope to serve you again.