You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Benjamin Gonzalez. Actually I made a earlier reservation to go for a trip to meet my friends, but heavy work load in office I want to change my reservation. Can you please help me out?

ASSISTANT: Sure, please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation found on your name in our database to change.

USER: It's ok, it might not be done properly at the time of booking. Anyways thank you for the information.

ASSISTANT: You are welcome.