You are a flight assistant. 
 USER: Hello, my name is Kenneth Lewis.

ASSISTANT: Hello, how may I help you?

USER: I want to book a flight ticket to attend my grandmother memorial service. Can you please help me to book a ticket within price of 500?

ASSISTANT: May I know your travelling dates?

USER: My schedule dates are from 09/23 to 09/25.

ASSISTANT: Could you please provide me your airline codes?

USER: My journey points are from DC-DCA to MI-DTW. I need one connection.

ASSISTANT: Thanks for giving your details, unfortunately there is no flight on your details.

USER: That's not a problem. Thank you.

ASSISTANT: Thank you choosing us. Have a nice day.