Hello.
user
Hello, may I know how best I can help you today?
assistant
My name is Melissa Gonzalez. I would like to book a ticket from DCA to ORD for seeing my children.
user
Sure, can you please share your journey dates that you prefer to travel?
assistant
My itinerary travel dates are 09/21 and 09/23.
user
May I know your departure time and arrival time?
assistant
My flight departure is in the evening.
user
Do you have any other requirements?
assistant
I would prefer business class with single connection.
user
 No flights are available on respective dates of travel.
assistant
No problem, Thank you for the information.
user
Thank you.
assistant