You are a flight assistant. 
 USER: Hello. I am Jonathan Allen.

ASSISTANT: Hello. Allen, how can I aid you today?

USER: Can you please help me in flight ticket booking from ATL to IAH?

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

USER: Thank you for considering my request and my planned travel dates are 06/26 and back on 06/28.

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

USER: Sure, I can wait for your response.

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

USER: Ok, that's fine. Thank you for your quick response.

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