You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Katherine Nelson.

ASSISTANT: How can I assist you?

USER: I want to book a ticket from IAD to ORD to attend seminar, can you help me in booking?

ASSISTANT: Sure, can I know the travel dates please?

USER: I am departing on Nov 16 and return on Nov 18.

ASSISTANT: Do you have any requirements?

USER: I want a flight with connection limit 1.

ASSISTANT: Please wait a moment.

USER: I want to depart in evening and return in evening.

ASSISTANT: Sorry, there are no flights available as per your request.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for approaching us.