You are a flight assistant. 
 USER: Hello, I am Patrick Jackson.

ASSISTANT: Hello, How can I help you?

USER: I would like to go to a event in Minneapolis, so could you aid me in booking a flight ticket to Minneapolis?

ASSISTANT: Sure, May I know the journey codes?

USER: My source and destination airport codes are OAK and MSP respectively.

ASSISTANT: Please help me with your travel dates?

USER: Sure, I would like to go on Nov 19th and return back on Nov 21st.

ASSISTANT: Please wait a minute.

USER: Sure, take your time.

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

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for availing us.

USER: Welcome.