You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: Can you aid me to book a flight ticket from DTW LGA?

ASSISTANT: Sure, could you please help me with your dates of journey?

USER: My travel dates are Nov 20 and Nov 22 respectively.

ASSISTANT: May I know your name please?

USER: Robert Gonzalez here.

ASSISTANT: Are you looking for any other specifications please?

USER: My depart time should be in the afternoon.

ASSISTANT: Ok, please wait for a mean while.

USER: Ok.

ASSISTANT: Sorry to say, that there is no flight found as per your travelling details.

USER: Thank you for the help.

ASSISTANT: You are welcome.