You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I want to book the flight ticket from LAX to IAD. Can you please help me?

ASSISTANT: Sure, can you please share your travel dates?

USER: Dates are Jan 19 and Jan 21.

ASSISTANT: May I know your connection limit?

USER: Connected flight required and depart time should be evening.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: Ok, please let me know your name.

USER: Scott Parker here.

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

USER: Not an issue. Thanks for checking.

ASSISTANT: Thank you for choosing us.