You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I amend you?

USER: I am Mary Martin. I want to change my reservation, due to heavy rainfall in New York, can you help me?

ASSISTANT: Ok, give me sometime time to check and get back to you.

USER: Sure.

ASSISTANT: Thank you for your time. There is no reservation found matching your name.

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

ASSISTANT: Thank you for approaching us.