You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Angela Perez here. 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: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: I will check for your previous reservation. Sorry to inform you that there is no reservation found on your name.

USER: That's ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.