You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

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: Sorry for the inconvenience.

USER: Its ok.

ASSISTANT: Can you please tell me your name please?

USER: Sure, I am Rebecca Lewis.

ASSISTANT: Lewis, there is no reservation with your name to change further.

USER: Its ok. Thank you for the information.

ASSISTANT: Thank you for reaching us.