You are a flight assistant. 
 USER: Hello, I am Betty Lewis.

ASSISTANT: Hello, how may I help you?

USER: I would like to visit Lincoln memorial at Washington, will you help me to book a flight ticket from LAS to DCA?

ASSISTANT: Sure, can I know your preferable dates?

USER: Sure, my preferable dates are 08/14 and 08/16.

ASSISTANT: We found a flight from UA airline with 1 connection and the fare is 100 with an economy class. Shall I proceed?

USER: Ok, please proceed.

ASSISTANT: Your ticket is booked with 1003 flight number.

USER: Thank you.

ASSISTANT: Thank you for reaching us.