You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I help you?

USER: Could you please change my existing reservation due to postpone of my exams?

ASSISTANT: Sure, may I know your name?

USER: My name is George Hall.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

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

USER: Not a problem, thank you for checking.

ASSISTANT: Thank you.