You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Andrew Campbell. I need to visit Museum of science at Boston. Can you please book me a flight ticket with in fare of 5000?

ASSISTANT: Sure. Could you provide your journey dates?

USER: My travelling dates are departure on 09/17 and return on 09/19 to San Francisco, CA - SFO.

ASSISTANT: Can you ensure your boarding airport code?

USER: My destination airport code is Boston, MA - BOS.

ASSISTANT: Ok, please wait for a minute.

USER: Make sure that I need direct flight.

ASSISTANT: Ok. Thank you for giving your time. Sorry, there is no flight found as on your request.

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Thank you for reaching our agency.