Hi, I am Sarah Roberts.
Hello, how can I assist you?
 I need to book a ticket for attending my friends grand event which is held at Washington DC-DCA on 04/18.
Ok, I can help you with that. Can you please provide your origin and return date?
Sure, I will return to Chicago ORD on 04/20.
Please wait a moment. I will check the availability.
Sure.
Thanks for your patience. Unfortunately there are no flights available with your requirements.
No problem, Thank you for searching.
Thanks for connecting with us. Have a good day.