You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

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, I will aid you. Please wait for a moment. May I know your name?

USER: Ok, I am Anthony Garcia.

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

USER: Ok, no problem. Thank you.

ASSISTANT: Welcome, thank you for reaching us.