You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

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.

ASSISTANT: Sure, I am here to help you. May I know your name please?

USER: Gary Thomas is my name.

ASSISTANT: Sorry Thomas, there is no reservation found as per your name in our database.

USER: That's ok, thank you.

ASSISTANT: You are welcome.Thank you for reaching us with a query.