You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am George Wilson, I want to Change my existing reservation due to health issues.

ASSISTANT: Sure, can you wait for a minute I will be back.

USER: Ok.

ASSISTANT: Thanks for your waiting, we have not found any flights on your given name.

USER: No problem, thank you for your service.

ASSISTANT: Thanks for choosing us.