You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I want to go for a round trip to Denver, CO-DEN, can you please help me in booking a ticket?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Could you please provide your preferred dates of travel?

USER: My preferable travel dates are from 11/06 to 11/08.

ASSISTANT: Do you have any specifications?

USER: I want a direct flight. My price limit is 5000.

ASSISTANT: May I know your good name?

USER: I am Cynthia Roberts.

ASSISTANT: Ok, please wait for a minute.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry, no flights are available to your desired locations.

USER: Ok, no problem. Thank you for your response.

ASSISTANT: Thank you for opting us.