You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

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

ASSISTANT: Sure, please share me your trip dates.

USER: My trip dates are from May 19 to May 21.

ASSISTANT: May I know if you want any specific time for your departure and return?

USER: Any time is ok for me.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I need a connecting flight.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: My name is Karen Taylor.

ASSISTANT: We found a AA airline and 1018 is flight number with a fare of 100. Shall I proceed?

USER: Please book it.

ASSISTANT: Your ticket is confirmed with an economy class.

USER: Thank you for choosing us.

ASSISTANT: Thank you for availing us.

USER: Have a nice day.