You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I support you?

USER: I need to change my existing reservation owing to an emergency.

ASSISTANT: Sure, we are here to assist you. May I know your good name please?

USER: My name is George Lopez.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there is no active reservation found in your name to change.

USER: Thank you.

ASSISTANT: Thank you for choosing us.