You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: Please help me in booking flight ticket from IAH to DEN to attend an event.

ASSISTANT: Sure, I am happy to help you. Could you please tell me your planned trip dates?

USER: My trip dates are May 08 to May 10.

ASSISTANT: Ok, please share your requirement about the airlines.

USER: I need a connecting flight.

ASSISTANT: Ok, can I know your preference about the class.

USER: I am okay with any class.

ASSISTANT: Can I know your name?

USER: Richard Davis.

ASSISTANT: Sorry, we have not found any flights running on your desired routes.

USER: Ok, no problem. Thank you.

ASSISTANT: You are most welcome. Thank you for contacting us.