You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I support you today?

USER: I am Edward Johnson. I would like to change an existing reservation due to my exams dates have been postponed.

ASSISTANT: Sure.

USER: Ok.

ASSISTANT: Please wait for a while.

USER: Sure.

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

USER: Not an issue. Thank you for your help.

ASSISTANT: Thank you have a nice day.