You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Susan Harris here. I would like change my reservation due to some health issues, can you please help me out?

ASSISTANT: Sure, please wait for a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, there is no reservation found on your name in our database to change.

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

ASSISTANT: You are welcome.