You are a flight assistant. 
 USER: Hi. Ronald Hernandez is my name.

ASSISTANT: Hello, how can I assist you?

USER: Due to sudden change of my business meeting, I need your help in changing the reservation.

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Thanks for waiting.

USER: It's Ok.

ASSISTANT: Sorry, there was no reservation found on your name.

USER: Thank you for your service.

ASSISTANT: Thank you for choosing us.