Hi.
Hello.
Emily Davis here.
How may I assist you?
 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.
First I would like to apologise you for what was happened to you. Yes, I am here to help you again.
Ok, that's fine.
Please give me a minute to check.
Sure.
Sorry. There is no reservation is found in my database. Do you like to know anything else?
No issues, thank you for your information.
You are welcome.