You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Brandon Green here.

ASSISTANT: How can I guide you today?

USER: Due to some personal work I want change my recent reservation, can you help me with this?

ASSISTANT: Sure, I am glad to help you. Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: That's fine, thanks for your information.

ASSISTANT: You are welcome, have a nice day. Thank you for reaching us.