Hello.
user
Hello. How may I aid you at this moment?
assistant
I am Nicholas Nelson. Can you please book a flight ticket from EWR to DCA?
user
Sure, provide your  travelling dates.
assistant
Thank you. I have planned to travel on dates of June 25 and June 27.
user
Ok, may I know your connection limit?
assistant
Yes, I am looking for single connecting flight.
user
Ok, do you have any other requirements?
assistant
Yes, I would like to depart in the evening time only so please make sure that.
user
Ok, please wait for few minutes.
assistant
Sure, take your time.
user
There are no flights found on your requested dates. Thank you for reaching us.
assistant
Oh! It is sad to hear. Anyway, thank you for your time.
user