You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my existing reservation, due to heavy heavy rain.

ASSISTANT: Ok, no issues, can you provide your name? Sorry, there is no reservation found on your name.

USER: My name is Jefferey Wilson.

ASSISTANT: Ok.

USER: That's ok, no problem. Thank you for checking.

ASSISTANT: Welcome, thank you for your assistance.