You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Margaret Young. I need to change my reservation due to some personal issues.So can you help me with changing of my reservation?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please, wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, I have not found any reservation on your name to change.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for approaching us.