You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I want to book a ticket from IAD to ORD to attend Board meeting. Can you please help me for booking?

ASSISTANT: Sure, On which dates would you like me to book a flight ticket for you?

USER: My scheduled dates are Sept 18 and Sept 21.

ASSISTANT:  In which class would you like me to book your flight ticket?

USER: I am comfortable with any class.

ASSISTANT: Let me know your connection limit?

USER: I want single connected flight.

ASSISTANT: On what name, do I need to reserve your ticket?

USER: Please reserve on the name of Thomas Perez.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT:  Ok, please wait a moment, let me search a flight for you.

USER: Ok.

ASSISTANT: Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions.

USER: Ok, Thank you for your help.

ASSISTANT: Thank you for choosing us.