You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, How can I assist you?

USER: I want to book a flight ticket to Washington, as I have an appointment with my family doctor. Please help me with a connecting flight.

ASSISTANT: Sure, May I know the journey codes?

USER: I want to fly from SFO to DCA.

ASSISTANT: Please help me with your travel dates.

USER: My travelling dates are from 08/01 to 08/03.

ASSISTANT: May I know your name?

USER: I am Andrew Anderson,.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: No problem, thank you.

ASSISTANT: Thank you.