You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I serve you?

USER: I am Paul Davis. I need to book a flight ticket from DEN to HOU, Can you please help me for booking?

ASSISTANT: Sure, Please help me with your travel dates.

USER: I would like to travel on 02/08 to 02/10.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for opting us.