You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I render you today?

USER: I need to attend my brother's marriage at  Washington, please book a flight ticket with a connection.

ASSISTANT: Sure, to book a flight ticket may I know your airport codes please?

USER: I want to fly from LAX to DCA.

ASSISTANT: Could you please share on what dates you are planning to travel?

USER: My travelling dates are from 02/10 to 02/12.

ASSISTANT: Can I have your name please?

USER: I am Stephanie Evans.

ASSISTANT: There was no flights found with your given information.

USER: That's fine, thank you.

ASSISTANT: Thank you for opting us.