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