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

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in changing my recent reservation?

ASSISTANT: Sure, I am here to help you. Please wait for a while.

USER: Ok, sure.

ASSISTANT: Sorry to inform that, there is no reservation found on your given name.

USER: Ok, fine thank you for checking.

ASSISTANT: Thanks for reaching us, have a nice day.

USER: Most welcome.