You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: Can you please book a ticket from IAH to DEN to go for Cultural festival?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My travelling dates are July 3 and July 5.

ASSISTANT: Are you looking for a connecting flight or direct flight?

USER: I want single connected flight.

ASSISTANT: Do you have any class preferences?

USER: No.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: My return time is afternoon.

ASSISTANT: Can you please provide your name to proceed further?

USER: Ok, I am Stephanie Carter.

ASSISTANT: Sorry, there are no flights available at your request.

USER: Ok, Thank you.

ASSISTANT: Thank you for contacting us, have a nice day.