You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Shirley Smith. I am looking for a direct flight from New York, can you please help me with booking a flight ticket?

ASSISTANT: Sure, I can help you with that. Could you please share your preferable travel dates?

USER: I would like to board on 03/24 and return on 03/26.

ASSISTANT: Can you please help me with the airport codes?

USER: My nearest source airport code is LGA and destination airport code is DFW.

ASSISTANT: Please allow me a moment while I check for the availability of flight on this route.

USER: Sure, take your time.

ASSISTANT: Shirley, I am sorry to inform you that there is no flight available at your request.

USER: That's ok, I will find an another alternate way to complete my trip. Anyways, thank you for the information.

ASSISTANT: You are welcome. Thank you for reaching us, have a great day.