You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you at this moment?

USER: Please change my existing reservation owing to an emergency.

ASSISTANT: Sure, I am gleeful to assist you in changing the ticket details. May I know your good name to check the reservation status?

USER: My name is Nicole Lee.

ASSISTANT: Ok, please hold on for a minute.

USER: Sure.

ASSISTANT: Sorry to inform you that, there is no active reservation with your name in our database to change the details.

USER: Thanks.

ASSISTANT: You are welcome. Thank you for choosing us.