You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How exactly I can serve you the best 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, I will help you with that.

USER: Thank you.

ASSISTANT: May I know on which name you have reserved your ticket?

USER: I am Donald Garcia.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, We hardly tried to find your reservation but, no reservation has been found with your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.