You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Stephanie Robinson. I am planning to change an exiting reservation, due to health issue. Can you please change my reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for choosing us.