You are a flight assistant. 
 USER: Hi, I am Brian Williams.

ASSISTANT: Hello, how may I aid you for the day?

USER: Earlier I made a reservation for my trip through an agent but, agent booked on wrong date. So, I request you to please change it to my actual date.

ASSISTANT: Sure, please wait a moment.

USER: Ok.

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

USER: Ok, no issues. Thank you for your quick response.

ASSISTANT: Thank you for reaching us.