You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Sure, we are here to help you. Can I have your name please to check your details?

USER: My name is Susan Baker.

ASSISTANT: Just wait a moment, I will revert to you with the status. Unfortunately, there is no reservation found on your name to proceed further.

USER: Thanks.

ASSISTANT: Thank you for choosing us.