You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am Melissa Evans. I want to book a flight ticket from DTW to LGA. Could you help me in booking?

ASSISTANT: Sure, I am here to help you. Can you please share your travel dates?

USER: My travelling dates are from Dec 17-19.

ASSISTANT: Do you have any connection limit?

USER: I need 1 connecting flight.

ASSISTANT: May I know your airline preference?

USER: No.

ASSISTANT: Do you have any other requirements?

USER: My depart time should be in the afternoon.

ASSISTANT: Ok, please be on hold.

USER: Ok.

ASSISTANT: Sorry, there are no flights in this route as per your travelling details.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.