You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Owing an emergency want to change my reservation, can you help me with it please?

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

USER: My name is Gary Thompson.

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

USER: That's fine, thank you for the help.

ASSISTANT: Welcome, thank you for reaching us.