You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Donna Nelson.

ASSISTANT: Is there any help that you need?

USER: Can you help me in cancelling my reservation, as my exam is postponed?

ASSISTANT: Sure, I will help you and please give me a moment.

USER: Ok.

ASSISTANT: There is no reservation found for the user name in our booking list.

USER: That's ok, thank you.

ASSISTANT: You are most welcome and thank you for reaching us.