You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you at this moment?

USER: Due to some health issue, I am unable to travel. Can you please change my existing reservation?

ASSISTANT: Sure, I am gleeful to assist you. Please wait for a few minutes.

USER: Sure.

ASSISTANT: To proceed further, we need your name.

USER: Sure, I am Jessica Scott.

ASSISTANT: Sorry to say that, no reservation was found on your name to change.

USER: Ok, Thank you for your help.

ASSISTANT: Thank you for visiting us.