You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: My name is Brian Taylor.

ASSISTANT: Yes, Brian.

USER: Due to a medical emergency at home. I would like to change my recent reservation.

ASSISTANT: Ok, please wait a moment let me check the details.

USER: Ok.

ASSISTANT: Sorry Brian, there is no reservation found.

USER: That's fine.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your time.