You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I amend you?

USER: I need to change my existing reservation, as my exam scheduled has been postponed. Please help me in changing?

ASSISTANT: Sure, I am here to help you. May I know your name to check reservation?

USER: My name is Janet Taylor.

ASSISTANT: Please, wait for a while.

USER: Ok.

ASSISTANT: Thank you for being patience, there is no reservation found on your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for approaching us.