You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you?

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

ASSISTANT: Sure, please hold on for a moment, let me check.

USER: Ok.

ASSISTANT: Can I know your name?

USER: I am Cynthia Thomas.

ASSISTANT: Thanks for sharing your details, we are unable to find any available reservations with your name in our database.

USER: Thanks.