You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Can you please help me for booking from DEN in a direct flight to reach my destination?

ASSISTANT: Sure, may I know your good name?

USER: My name is Sarah Walker.

ASSISTANT: Could you please provide your landing airport code?

USER: Destination airport code is HOU.

ASSISTANT: May I know your planned travel dates?

USER: My trip dates are on March 24 and 26.

ASSISTANT: Do you have any specifications?

USER: I need a flight in normal cost airline and my return flight time is afternoon.

ASSISTANT: Sorry, there are no flights available as per your requirements.

USER: Ok, thank you.

ASSISTANT: Thank you for opting us.