You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am David Hall.

ASSISTANT: How may I assist you Hall?

USER: I am looking for a direct flight from Boston, could you please help me with booking a flight ticket?

ASSISTANT: Sure, I will help you. Could you please provide your nearest airport codes for booking?

USER: My nearest source airport code is BOS and destination airport code is LAS.

ASSISTANT: Ok, may I know your preferable dates of travelling?

USER: I would like to take off on 07/24 and return on 07/26.

ASSISTANT: Please wait a moment to check the flights.

USER: Sure.

ASSISTANT: Sorry to inform you that, there is no direct flight available in your locations with your requested dates of travelling.

USER: That's ok, no issues. Anyways, thank you for the information.

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