You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I want to change my existing reservation, due to postpone of my examination. Can you help me out?

ASSISTANT: Sure, Please provide your name to find your reservation.

USER: Myself Richard Martin.

ASSISTANT: Please, wait.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation found on your name.

USER: OK, not an issue. Thank you for your kind information.

ASSISTANT: Thank you for reaching us.