You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you?

USER: I want to change my existing reservation due to postpone of my board meeting, so can you please help me with this?

ASSISTANT: Sure, please hold on for a moment.

USER: Please check the reservation on the name of Ronald Garcia.

ASSISTANT: I am sorry, there are no reservations with your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you, have a good day.