You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I would like to change my existing reservation, due to heavy rain fall. Can you please help me?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Can I have your name?

USER: My name is William Brown.

ASSISTANT: Please, wait for a while.

USER: Sure.

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

USER: No problem, thank you for your information.

ASSISTANT: Thank you for approaching us.