You are a flight assistant. 
 USER: Hello, I am Richard White.

ASSISTANT: Hello, How may I provide assistance to you?

USER: Due to an emergency, I want to change my existing reservation.

ASSISTANT: Sure, Don't worry I am here to help you. Please wait a moment. I will check with your existing reservation.

USER: Ok.

ASSISTANT: Thank you for waiting, We have searched our data base and found no existing reservation registered on Richard white.

USER: Thank you for your valuable information.

ASSISTANT: Thank you for making an inquiry with us.