You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I want to book a flight ticket from Las Vegas to attend an interview in New York, can you help me in booking?

ASSISTANT: Sure, can you please share me with your dates of journey?

USER: I intend to start on Dec 6th and my return date will be on Dec 8th.

ASSISTANT: Ok, may I know your respective airport codes of journey?

USER: My source point is LAS and my destination point is LGA.

ASSISTANT: Do you have any other requirements please?

USER: I want a economy class ticket.

ASSISTANT: Please wait for a mean while.

USER: Sure.

ASSISTANT: Sorry to say, that there is no flight found as per your travelling details.

USER: No issues, I'll choose any alternative to reach my destination. Thank you.

ASSISTANT: May I know your name please?

USER: I am John Nelson.

ASSISTANT: Anyways, thank you for your service.