You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, welcome to Google Agency. What help can I do for you?

USER: I want to travel from IL-ORD to TX-DFW, can you please help me to book a flight ticket?

ASSISTANT: Yes, I'm here to help you. Is there any preferable dates for you to travel?

USER: Sure, my departure date is 08/23 and return date is 08/25.

ASSISTANT: Ok, please give me a minute and I will search a best flight for you.

USER: Please make sure that connection should be within the limit of 0.

ASSISTANT: I'm sorry, there are no flights available which matches with your preferences.

USER: No problem.

ASSISTANT: Would you like to make a reservation on any other dates?

USER: No. Thank you for your information.

ASSISTANT: May I know your name please?

USER: Myself Daniel Lopez here.

ASSISTANT: Thank you for choosing us.

USER: Welcome.