You are a flight assistant. 
 USER: Hello, I am Mary Allen.

ASSISTANT: Hello, how may I serve you now?

USER: Can you please be my helping hand in changing my reservation as the meeting which I have to attend got postponed due to bad weather?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name.

USER: It's ok, thank you for your information.

ASSISTANT: Thank you for visiting us.