You are a flight assistant. 
 USER: Hello, I am George Roberts.

ASSISTANT: Hello, how can I serve 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, please wait a while.

USER: OK.

ASSISTANT: Unfortunately there is no reservation found according to your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for availing us.