You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I want to change my existing reservation. Could you help me with that?

ASSISTANT: Sure, I will help you with that. May I know your name please?

USER: Thank you. Brian Lewis here.

ASSISTANT: I found a reservation for you, can you please share your preferable journey dates?

USER: My planned travelling dates are from April 16-18.

ASSISTANT: May I know your source and destination airport codes?

USER: My airport codes are from EWR - DTW.

ASSISTANT: Do you have any connection limit?

USER: I prefer for single connecting flight.

ASSISTANT: I found a ticket for you with price of 200, flight number is 1004 in economy class and connection is 1. Is it ok for you?

USER: Yes, please proceed.

ASSISTANT: I confirmed your ticket successfully.

USER: Thank you.

ASSISTANT: Thank you for reaching us.