You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I would like to visit New York to meet my cousin, please help me in booking a ticket from DTW to LGA.

ASSISTANT: Sure, may I know your scheduled travel dates?

USER: My planned travel dates are on Apr 19 and Apr 21.

ASSISTANT: Do you have any requirements?

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

ASSISTANT: Ok, please wait for a while.

USER: Sure, I need a direct flight.

ASSISTANT: Sorry, there were no flights found with your requirements.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: May I know your name for documentation process?

USER: My name is Betty Lee.

ASSISTANT: Thank you for contacting us.