You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jacob Baker from Detroit.

ASSISTANT: How may I occur you?

USER: I want to change my travel dates in my previous reservation so can you please help me with that?

ASSISTANT: Sure, I am gleeful to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry to inform you that, there are no reservation found on your name.

USER: Oh! It's ok no problem. Thank you for your information.

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