You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Ronald Garcia here.

ASSISTANT: How may I guide 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: Ok. We are here to help you.

USER: Thank you.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there is no active reservation found on your name to change.

USER: That's ok, thank you.

ASSISTANT: Thank you for approaching us.