Hello.
user
Hello, how may I assist you?
assistant
 As I am a scientist, I want to attend science festival with my students at Washington. Can you help me to book a ticket from PHX to DCA?
user
Sure, may I know your planned travel dates please?
assistant
My journey dates are 09/10 and 09/12.
user
Please wait for a moment.
assistant
Sure.
user
Sorry, there is no flight available on your requested dates.
assistant
No problem, Thanks for the information.
user
May I know your good name please?
assistant
Mark Lopez here.
user
Thank you.
assistant