You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Carolyn Baker here.

ASSISTANT: How may I help you?

USER: I would like to change my reservation as my exams postponed to next week, can you please help me with that?

ASSISTANT: Sure, I can help you and please allow me a moment to check it.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting, there is no reservation found on the user name in our back end to help you out.

USER: That's ok, no problem. Anyway thank you for the information.

ASSISTANT: You are most welcome and have a nice day.