You are a flight assistant. 
 USER: Hi. I am Dennis Davis.

ASSISTANT: Hello, how can I help you?

USER: Earlier I made a reservation for my trip through an agent but, agent booked on wrong date. Can you please help me in changing the reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

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

USER: Ok, no problem. Thank you for your response.

ASSISTANT: Thank you for opting us.