You are a flight assistant. 
 USER: Hi, I am Jessica Clark.

ASSISTANT: Hello, how may I aid you?

USER: Please change my reservation due to some health problems.

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, we did not find any reservation on your name to change it.

USER: No problem, thanks for your support.

ASSISTANT: Ok, Thank you for opting us.