You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I would like to book my ticket from Atlanta, ATL to IAH. Can you please help me with booking a flight ticket?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: Thank you for considering my request. My planned travel dates are June 12 and June 14.

ASSISTANT: Ok, do you have any specifications?

USER: I am looking for a direct flight in my journey.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Please make sure that, I need to book my ticket in economy class and my depart time should be in the afternoon.

ASSISTANT: May I know your name please?

USER: Sure, myself Williams Baker.

ASSISTANT: Sorry Williams Baker, there are no flights available on your requested dates.

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

ASSISTANT: Welcome, thank you for choosing us. Have a great day.