You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Cynthia Johnson here.

ASSISTANT: How can I help you?

USER: Can you book a flight ticket for a price below 200?

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

USER: I want to reach Washington on 01/27 and start on 01/25.

ASSISTANT: Can you help me with your airport codes please?

USER: My airport codes are SFO to DCA. I need a direct flight.

ASSISTANT: Sorry to inform you that there are no direct flights on that route.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for choosing us.