You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How shall I help you?

USER: Due to the health issues, I am unable to catch a flight. So I had request to you to change my existing reservation?

ASSISTANT: Please provide your name?

USER: Sure, my name is Carolyn Edwards.

ASSISTANT: I'm sorry, no reservation exists.

USER: Ok, no issues.

ASSISTANT: Thanks.