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

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation due to postpone of my friends marriage.

ASSISTANT: Ok, please give me a minute I will get back to you.

USER: Ok.

ASSISTANT: Thank you for your time, sorry no reservation found with your name.

USER: Ok, not an issue.

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

USER: Thank you for providing information.