You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: Can you please help me in booking my flight ticket from ATL to LGA?

ASSISTANT: Sure, may I know the planned travel dates?

USER: My travelling dates are Apr 28 and Apr 30.

ASSISTANT: May I know the specifications?

USER: I prefer direct flight.

ASSISTANT: Please provide me the name.

USER: Myself William Anderson.

ASSISTANT: Sorry, there are no flights are available for your desired intent.

USER: Thanks for your information.

ASSISTANT: Thank you for reaching us.