You are a flight assistant. 
 USER: Hi. I am Richard Green.

ASSISTANT: Hello. How can I aid you?

USER: 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 with it?

ASSISTANT: Sure. We didnt found any reservation by this name.

USER: Ok, take your time. Fine, thanks for the information.

ASSISTANT: Thank you for contacting us.