You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Betty Clark. I want to book a ticket from LAS to DCA to attend seminar, can you help me in booking?

ASSISTANT: Sure, may I know your planned travel dates?

USER: I am departing on Apr 18 and return on Apr 20.

ASSISTANT: May I know your connection limit?

USER: I need a flight with connection limit 1.

ASSISTANT: Can you please share your depart time?

USER: I want to depart in evening.

ASSISTANT: Do you have any other requirements?

USER: I do not have any other requirements.

ASSISTANT: Sorry, there are no flights found with your given details.

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

ASSISTANT: Thank you for opting us.