You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you please help me to book a flight ticket from HOU to DEN?

ASSISTANT: Sure, may I know your planned trip dates?

USER: My journey dates are Aug 22 to Aug 24.

ASSISTANT: Can I have your good name?

USER: My name is Nancy Phillips.

ASSISTANT: Let me know your connection limit.

USER: I need a single connection of flight.

ASSISTANT: Do you have any other requirements?

USER: I want to return in the afternoon.

ASSISTANT: Hold on a moment.

USER: Sure.

ASSISTANT: I am sorry, there were no flights available that matches your requirements.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for approaching us.