You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please help me in booking a flight ticket from LGA to PHL?

ASSISTANT: Sure, can you please provide your journey dates?

USER: Sure, my travel dates are from Mar 21 to Mar 23.

ASSISTANT: Are you looking for any preferred class?

USER: I prefer economy class for my journey.

ASSISTANT: Do you have any other specifications to be met?

USER: I need a direct flight.

ASSISTANT: Can I have your name to proceed?

USER: Helen Carter here.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

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

ASSISTANT: Thank you for reaching us.