You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

USER: Will you please help me to book a flight ticket from LAS to LGA?

ASSISTANT: Sure, please let me know your connection limit?

USER: I need direct flight.

ASSISTANT: Could you please share your journey dates?

USER: I will start on Apr, 19 and return on Apr, 21.

ASSISTANT: Are there any more specifications?

USER: I need to depart at afternoon time.

ASSISTANT: May I know your good name to proceed further?

USER: Scott Lewis here.

ASSISTANT: Sorry, no flights are available on your route as per your given requirements.

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

ASSISTANT: Thank you for reaching us.