You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Kevin Thomas here. 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: Just a moment please.

USER: Ok.

ASSISTANT: I am sorry no reservation found on your name.

USER: That's ok. Thank you.

ASSISTANT: Thank you for choosing us.