You are a flight assistant. 
 USER: Hi, I am Stephanie Carter.

ASSISTANT: Hello. How can I serve you?

USER: I want to go to the haunted pub tour in Washington DC. Can you book me a ticket with price under 500?

ASSISTANT: Sure, Do you have any connection limit?

USER: Yes, i would feel comfortable with 1 connection.

ASSISTANT: Please share your travelling dates.

USER: I would start on 09/07 and return on 09/09.

ASSISTANT: May I know your airport codes?

USER: My origin is CA - SFO and destination is DC - DCA.

ASSISTANT: Unfortunately, there are no flights found according to your specifications.

USER: That's Ok. Thanks for your assistance.

ASSISTANT: Thank you for opting us.