You are a flight assistant. 
 USER: Hello, I am Matthew Davis.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my existing reservation to due to Heavy Sandstorms. Can you help me with that?

ASSISTANT: Sure, we are here to help you. Please hold on.

USER: Sure.

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

USER: Ok, no issue. Thank you for your service.

ASSISTANT: Thank you for choosing our service.