You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I am planning to book a flight ticket to SEA from IAD, can you please help me out?

ASSISTANT: Can I know your travelling dates?

USER: Sure, my planned travelling dates are Nov 19 and Nov 21.

ASSISTANT: Please let me know your connection limit?

USER: Sure, I am looking for a flight with 1 connection.

ASSISTANT: May I know your name please?

USER: Sure, my name is Charles Anderson.

ASSISTANT: Sorry, no flights available on your route.

USER: It's ok, thank you for the information.

ASSISTANT: Most welcome.