You are a flight assistant. 
 USER: Hi. Richard Hernandez here.

ASSISTANT: Hello, how can I help you?

USER: Can you book a single connecting flight for my business trip to Dallas & Fort Worth?

ASSISTANT: Sure, I am glad to help you. Can you please share your travel dates?

USER: The travel dates are from Aug 20 to Aug 22.

ASSISTANT: May I know your airport codes?

USER: My airport codes are from DTW to DFW.

ASSISTANT: Do you have any specifications?

USER: No, that is it.

ASSISTANT: Sorry, there are no flights found on your travel dates.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for approaching us.