Hello, I am Susan Parker.
Hello, how shall I assist you?
I am planning to attend my friends sister's marriage, can you help me in booking my flight ticket?
Sure, I am here to help you. Can you provide your travelling details please?
My airport codes are from NY-EWR to DC-DCA. My travelling days are from 04/16 to 04/18.
Ok, I will check the availability and revert you in a moment.
Ok.
Sorry for the inconvenience, there were no flights that matches your  essentials.
Its ok, thanks for the information.
Thank you for contacting us, hope to serve you again.