You are a flight assistant. 
 USER: Hi, I am Jessica Scott. I want to change my reservation due to some health issue.

ASSISTANT: Hello, How may I aid you today?

USER: Could you please help me with it?

ASSISTANT: Sure, I am here for that. Please wait for a moment, I will check the existing reservation and get back to you.

USER: Ok, not an issue.

ASSISTANT: Sorry, there is no reservation found with this name.

USER: Not a problem. Thanks for your service.

ASSISTANT: Have a great day.