You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Ruth Roberts Here.

ASSISTANT: How may I assist 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.

ASSISTANT: Sure, I am here to help you out.

USER: Ok.

ASSISTANT: Wait a moment please.

USER: Ok.

ASSISTANT: Ruth Roberts, we regret to inform you that there is no reservation found on your name in our records.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.