Hello.
Hello, how can I assist you for the day?
My name is Edward Nelson. I want to do some changes in my existing reservation, can you help me for that?
Sure, we are here to hep you with this changing  reservation. Ok, wait for a moment.
Thank you.
Thank you for waiting.
Sure, I will wait for your response.
I have found your previous reservation with your name. Can  you please mention your new preferable airport codes for changing your reservation?
My new travelling airport codes are BOS to DTW.
May I know your new travelling dates?
My travelling dates are Jan 19 and Jan 21.
Do you have any other specifications?
I need a single connecting flight.
There are no flights available as per your requirements.
That's ok, thank you for checking.
You are welcome, thank you for choosing our agency.