You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I want to change my reservation due to health problem, can you help me?

ASSISTANT: Please may I know your name?

USER: I am Jessica White.

ASSISTANT: Please wait a while.

USER: Sure.

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

USER: No problem, thanks for checking.

ASSISTANT: Thank you for opting us.