You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Stephen Allen. Actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office I want to change my reservation. Can you help me in changing?

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

USER: Ok.

ASSISTANT: Sorry Stephen Allen, no reservation found on your name in our data list.

USER: It's Ok, thanks for your assistance.

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