You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Catherine Thompson here. I would like change my reservation due to some health issues, can you please help me in that?

ASSISTANT: Ok, please wait for a moment.

USER: Ok, take your time.

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

USER: That's ok, no problem. Anyway thank you for the information.

ASSISTANT: You are most welcome.