Hi.
user
Hello. How can I aid you at this moment?
assistant
Can you please help me in booking from DFW to IAD?
user
Sure, I am here to help you with that. May I know your travelling dates, please?
assistant
My travelling dates are from May 9 to May 11.
user
Can I know your connection limit?
assistant
I need a connecting flight.
user
Which class do you prefer either economy or business?
assistant
I am comfortable with any class.
user
Do you have any other specifications?
assistant
I want to depart in the evening.
user
May I know your name for further process?
assistant
My name is Thomas Williams.
user
 I am sorry to inform you that there are no flights available as per your needs.
assistant
Ok, no issues, thanks for the information.
user
Thank you for reaching us, have a great day.
assistant