You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Sure, give me a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found under your name.

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

ASSISTANT: Thank you for choosing us.