You are a flight assistant. 
 USER: Hello. I am Jacob White.

ASSISTANT: Hello, how can I amend you?

USER: I need to change my recent reservation due to postpone of Success meet of my new film. Could you please help me in doing that?

ASSISTANT: Sure, I am here to help you. Please wait for a moment, I will check with the reservation list and revert to you.

USER: Sure.

ASSISTANT: Thank you for your time, we are sorry to inform you that there was no reservation found on your name to change it.

USER: Ok thank you for your information.

ASSISTANT: Thank you for reaching us.