You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, I am here to help you. Can you please let me know your good name?

USER: My name is Ryan Anderson.

ASSISTANT: Sorry, there is no active reservation on your name in our records.

USER: Thank you.

ASSISTANT: Thank you for choosing us.