You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Christopher Edwards. I would like to explore the world through science and art at Exploratorium which is located at San Francisco.

ASSISTANT: Ok.

USER: So, please assist me in making a reservation from Minneapolis & St.Paul.

ASSISTANT: Sure, could you please provide me your source and destination airport codes?

USER: I have to leave from MSP to reach SFO. Please make sure that it should be a direct flight.

ASSISTANT: Ok, may I know your planned journey dates?

USER: My journey dates are from 07/15 to 07/17.

ASSISTANT: Ok, let me know your price limit.

USER: It is 500.

ASSISTANT: Sorry, no flights found with your given dates.

USER: It's ok. Thank you.

ASSISTANT: Thanks for choosing us.