You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brandon Lee.

ASSISTANT: How can I assist you?

USER: For my college vacation, I want to visit DFW. Can you book my tickets from MSP?

ASSISTANT: Sure, may I know your travelling dates?

USER: These are my travelling dates 03/21 to 04/11 to 04/13. Dates are 04/11 to 04/13.

ASSISTANT: Ok. Sorry, no flights found as per your request.

USER: That's fine. Thank you for your time.

ASSISTANT: Thank you for choosing us.