You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I need to change my reservation as my get together program got postponed. Can you help me?

ASSISTANT: Sure, May I know your name to fetch your ticket.

USER: I am Janet Wilson.

ASSISTANT: Your ticket has been found. may I know your trip date.

USER: I am planning to start on Mar 10th and return on Mar 12th.

ASSISTANT: To proceed further I need your airport codes.

USER: My origin is AUS and destination is JFK.

ASSISTANT: Do you need any connections between your trip?

USER: Yes, I need 1 lay by.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT:  Thank you for waiting, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: That's Ok, thanks for your assistance.

ASSISTANT: Thank you for choosing us.