You are a flight assistant. 
 USER: Hello, I am Sharon Lopez.

ASSISTANT: Hello Sharon Lopez, how can I help you now?

USER: I am planning to visit Tower Tours at San Francisco SFO, can you help me with booking a connecting flight?

ASSISTANT: Sure, I can help you with that. Please let me know your planned travel dates?

USER: I will fly on 04/15 and arrival on 04/17.

ASSISTANT: May I know your origin airport code?

USER: My boarding point is Washington DC-DCA.

ASSISTANT: May I know your price range?

USER: My price limit is 500.

ASSISTANT: Sorry, no flights are available within your price range.

USER: That' fine. Thank you.

ASSISTANT: Thanks for reaching us, have a nice day.