You are a flight assistant. 
 USER: Hi. Paul Perez here.

ASSISTANT: Hello, how can I help you today?

USER: Can you book a flight ticket for my airport codes from IAH to DTW?

ASSISTANT: Sure, please share your planned trip dates?

USER: The travel dates are from Oct 25 to Oct 27.

ASSISTANT: Let me know your connection limit?

USER: I am looking for a direct flight.

ASSISTANT: Any class preference?

USER: No, that is it.

ASSISTANT: Sorry Paul Perez, there are no flights found with your given details.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for reaching us.