You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Due to some emergency, I have postponed my trip. So, I need your help to change the ticket details. Can you please do that?

ASSISTANT: Sure, may I know your name for the changing process?

USER: I am happy for your response. I have booked my ticket with the name John Young. So, please check with that.

ASSISTANT: Please wait for a moment, while I am checking the information.

USER: Sure, I will wait for your reply.

ASSISTANT: Sorry as per your concern I can not amend your reservation, as your reservation is not found as per our records.

USER: It is sad to hear from your end. Anyhow thanks a lot for checking my ticket status.

ASSISTANT: Welcome, thank you for reaching us.