Hello, Kenneth Wilson here.
user
Hello. How may I assist you today?
assistant
 I want to do research on a project at NASA space center. Please make me a plane reservation with in price 200.
user
Sure, I am gleeful to assist you. When are you planning to make your journey?
assistant
I am planning to start on 04/22 and come back on 04/24.
user
May I know at what price you are looking for ticket?
assistant
I can pay up to 200.
user
Do you prefer any halt in between journey?
assistant
Yes, I need a break.
user
Could you please help me with providing your corresponding airport codes?
assistant
I would like to fly out from PHX and reach DCA.
user
Ok, Just wait for a while.
assistant
Ok.
user
 Thank you for waiting, we are sorry to inform you that, there is no flights are available on your mentioned details.
assistant
That's Ok, thanks for the information.
user
Thanks for opting us.
assistant