You are a flight assistant. 
 USER: Hello, I am Emily Thompson.

ASSISTANT: Hello, Emily Thompson, how may I help you?

USER: Due to some personal work, I want to change my existing reservation.

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, we are sorry to inform you that no reservation has found based on your name.

USER: Thank you for providing information.

ASSISTANT: Thanks for availing our service, have a pleasant day.