You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Can you aid me in booking a flight ticket in normal cost airline?

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

USER: I am planning to start on Aug 20th and return back on Aug 22nd.

ASSISTANT: Ok, can you please provide your airport codes?

USER: Search for the flights available from IAD to DFW.

ASSISTANT: Ok, do you have any specifications?

USER: Make sure that connection of the flight not exceeding to 1.

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

USER: Take your time.

ASSISTANT: May I know your name please?

USER: Myself Patrick Thompson.

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

USER: No issues. Thank you for checking.

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

USER: You are welcome.