You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Deborah Robinson. I am planning to visit Washington IAD to meet my grand father. Can you make a reservation for me?

ASSISTANT: Sure, may I know your origin airport code?

USER: Ok, my source code is from ORD.

ASSISTANT: Ok, let me know your travel dates.

USER: Ok, my itinerary dates are on Nov 22 and return on Nov 24.

ASSISTANT: May I know your airline preference?

USER: No, but I want to depart in the afternoon time.

ASSISTANT: Ok, do you have any connection limit?

USER: Yes, I need a single connecting flight.

ASSISTANT: In which class do you prefer to travel?

USER: No, I don't have any class preferences.

ASSISTANT: Sorry for the inconvenience, there are no flights in this route as per your travelling details.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for approaching us.