You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I help you?

USER: Due to some personal reason I need to change my existing reservation.

ASSISTANT: May I know your name?

USER: Rachel Carter is my name.

ASSISTANT: Wait a minute.

USER: OK.

ASSISTANT: Sorry to tell that there is no reservation on your name.

USER: OK, no problem. Thanks for your information.

ASSISTANT: Thank you and take care of your health.