You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: Can you help me to change the dates of my reservation as my exam got postponed?

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

USER: My name is Raymond Garcia.

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

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, thank you for reaching us.