You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Can you help me to book a direct flight?

ASSISTANT: Sure, may I know your airport codes?

USER: My airport codes are MSP and DFW.

ASSISTANT: Can you please help me with your good name?

USER: I am William Baker.

ASSISTANT: May I know your travelling dates?

USER: My travel dates are June 12 and June 14.

ASSISTANT: Do you have any other requirements?

USER: I would like to return back in the afternoon time.

ASSISTANT: Sorry, there is no flight found with your required dates to travel.

USER: No problem, thank you for the information.

ASSISTANT: Thank you.