You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I want to change my existing reservation which is done recently due to some problems, can you please help me?

ASSISTANT: Yes, I can help you. Can you share me your name for checking?

USER: Sure, my name is Catherine Young.

ASSISTANT: I have found reservation on your name. Can you tell me your travelling dates?

USER: Sure, I am happy to hear that there is a reservation found and my dates of travel are from 06/21 to 06/23.

ASSISTANT: Ok, can I know your nearest airport codes?

USER: Ok, my respective airports codes are from EWR to DTW.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: I have found a flight ticket with a price of 100 and 1 connection.

USER: Ok, please proceed with this booking.

ASSISTANT: Ok, your ticket has been booked.

USER: Thank you for your help in booking.

ASSISTANT: Thank you for consulting us.