You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How may I help you today?

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

ASSISTANT: Sure, may I know your good name please?

USER: I am Samantha King.

ASSISTANT: Ok, please wait for some time.

USER: Sure.

ASSISTANT: THere is no existing reservation found on your name in our data base.

USER: Thanks.

ASSISTANT: Thank you for opting us.