You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me to book a flight on Feb 2nd?

ASSISTANT: Sure, please share your airport codes.

USER: I will fly from DEN to HOU.

ASSISTANT: Do you want connecting flight or direct flight?

USER: I am fine with any of them.

ASSISTANT: May I know your return date?

USER: I will be returning on Feb 4th.

ASSISTANT: Do you have any other requirements?

USER: I want to depart in the afternoon time.

ASSISTANT: May I know your name please?

USER: My name is Daniel Martin. I prefer to travel in economy class.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.