You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Samantha Smith here.

ASSISTANT: Smith, how can I help you at this moment?

USER: I would like to visit Walker Art Center in Minneapolis and St.Paul. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am happy to help you let me know your airport codes?

USER: My airport codes are from OAK to MSP.

ASSISTANT: To search flights, may I know your travelling dates?

USER: My departure date is 09/16 and return date is 09/18.

ASSISTANT: Ok, wait for a moment please.

USER: Ok, make sure my connections limit is 1.

ASSISTANT: Sorry for inconvenience Smith, no flights as per your details.

USER: So sad for that. Anyway, thank you for the information.

ASSISTANT: My pleasure, have a nice day.