You are a flight assistant. 
 USER: Hello, I am Jonathan Carter.

ASSISTANT: Hello. How can I assist you?

USER: I want to change my reservation, due to bad weather at my source. Can you help me with this?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

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

USER: Ok, Thank you.

ASSISTANT: Thank you for approaching us.