You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to book a flight ticket from DEN to ATL to meet my friend. Can you help me in booking a connected flight?

ASSISTANT: Sure, please provide your trip dates.

USER: My journey dates are June 11 and June 13.

ASSISTANT: Do you have any other requirements?

USER: I am looking for departure flight time at evening.

ASSISTANT: Ok, please wait a minute.

USER: Sure. Please make sure that I prefer a economy class.

ASSISTANT: May I know your name?

USER: I am Daniel Martin.

ASSISTANT: Sorry, we regret to inform you that there is no flights available.

USER: No problem, thank you for your information.

ASSISTANT: Most welcome.