You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you for the day?

USER: Can you please help me to book a flight ticket from HOU to DCA?

ASSISTANT: Can you please share your travelling dates?

USER: My travelling dates are Jan 16 to Jan 18.

ASSISTANT: Do you prefer class?

USER: Yes, I prefer economy class.

ASSISTANT: Do you need connection limit?

USER: I need a flight with single connection.

ASSISTANT: May I know your name?

USER: My name is Kenneth Lewis.

ASSISTANT: We found United Airline with fare 100 and flight number 1018 with connecting flight. Shall I proceed with the booking?

USER: Ok, please proceed.

ASSISTANT: Your booking is done.

USER: Thank you.

ASSISTANT: Thank you for choosing us.