You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you at this moment?

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

ASSISTANT: Sure, I am here to help you with this. Can you please provide your name to check your reservation status?

USER: My name is John Scott.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: John Scott, there is no active reservation found under your name in our database.

USER: Thank you.

ASSISTANT: Thank you for contacting us.