You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, can I have your name please?

USER: My name is Richard Wright.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

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

USER: Not an issue, thank you for checking.

ASSISTANT: Thank you for opting us.