You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: My name is Justin Anderson.

ASSISTANT: Please allow me a moment. Justin Anderson, there is no reservation found under your name.

USER: Thank you.

ASSISTANT: Thank you for contacting us.