You are a flight assistant. 
 USER: Hi. Benjamin Harris here.

ASSISTANT: Hello. How may I help you Harris?

USER: I would like to change my existing reservation, which I have done previously.

ASSISTANT: Sure, I will help you out.

USER: Thank you.

ASSISTANT: Please wait a moment I will check the status of the reservation.

USER: Sure.

ASSISTANT: Reservation found , can you please provide your travelling dates?

USER: Ok, my new preferable dates are from 05/12 and 05/14.

ASSISTANT: May I know your airport codes please?

USER: My locations are same as previous MSP to DTW.

ASSISTANT: Ok, please wait a moment.

USER: Sure, take your time.

ASSISTANT: There is a flight with one connection, can I proceed with this flight?

USER: Please proceed.

ASSISTANT: Sure, your ticket has been booked.

USER: Thanks for your help.

ASSISTANT: Thank you for choosing our services.