You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I support you today?

USER: This is Rebecca Robinson. I want to change my recent reservation due to postpone of exams. Can you help me in that?

ASSISTANT: Sure, we are glad to help you to change it.

USER: Thank you.

ASSISTANT: Please wait for a couple of minutes.

USER: Ok.

ASSISTANT: Thanks for being patient, there was no active reservation on your name to change it.

USER: Ok, it is not an issue. Thank you for your service.

ASSISTANT: Thank you for approaching us.