Hello,.
user
Hello, how may I serve you today?
assistant
I am Joseph Hall. I need to attend workshop in Smithsonian Institution at Washington, IAD. Can you please make a reservation from Philadelphia, PHL?
user
Sure, may I know your travelling dates?
assistant
My journey dates on 07/31 and 08/02.
user
Please wait a minute.
assistant
Sure.
user
There is no flight available on your route.
assistant
Ok, no problem. Thank you.
user
Thank you.
assistant