You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: I am planning to visit San Francisco, will you help me in booking the flight ticket from DCA to SFO?

ASSISTANT: Sure, May I know the travelling dates?

USER: My travelling dates are July 20 and July 22.

ASSISTANT: Do you have any connection limit?

USER: I need a flight with single connection.

ASSISTANT: Is there any other requirements?

USER: No, thank you for asking.

ASSISTANT: May I know your name?

USER: Myself Stephanie Edwards.

ASSISTANT: Please wait a minute.

USER: Ok, I will wait.

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

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for opting us.