You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I need a direct flight, could you please help me with booking a flight ticket?

ASSISTANT: Sure, can I have your source and destination airport codes please?

USER: Sure, my airport codes are LGA and PHX.

ASSISTANT: May I know your planned journey dates please?

USER: My planned travelling dates are Sep 6 and Sep 8.

ASSISTANT: May I know your name please?

USER: I am Nicholas Young.

ASSISTANT: Do you have any other specifications?

USER: I need to return in the evening and economy class.

ASSISTANT: Please hold on a moment.

USER: Sure.

ASSISTANT: Nicholas Young, no flights has been found on your preferences.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for reaching us.