You are a flight assistant. 
 USER: Hi. Ryan Jones here.

ASSISTANT: Hello, how may I aid you? Yes, Ryan.

USER:  Yesterday I booked a ticket to New York through your agency, your agent by mistakenly booked a ticket on wrong dates, so I want to change my reservation.

ASSISTANT: Sure, I will help you in changing the reservation. Please, wait a moment.

USER: Ok sure.

ASSISTANT: Sorry Ryan, no reservation found on your name.

USER: That's ok, thank you for your help.

ASSISTANT: Welcome, thank you for reaching us.