You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Patrick Williams.

ASSISTANT: How can I help you today?

USER: Can you please aid me in booking my flight ticket from DEN to IAH?

ASSISTANT: Sure, I am very gleeful to help you with that, can you share me your travel dates?

USER: My trip dates will be Apr 4th to Apr 6th.

ASSISTANT: Do you have any class or airline preference?

USER: I am fine with any class.

ASSISTANT: Can you share me your depart and return time?

USER: I would like to catch my return flight in the afternoon.

ASSISTANT: Is there any other specifications?

USER: I need a connecting flight.

ASSISTANT: Sorry to say this, no flights are available on your desired route.

USER: Its ok, thank you.

ASSISTANT: Thank you for reaching us.