You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Jack Thompson. Can you please book a flight ticket from ATL to DEN?

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates are 10/05 and 10/07.

ASSISTANT: At what time do you like to travel?

USER: I want to return at afternoon.

ASSISTANT: Do you prefer economy or business class?

USER: I am ok with any class.

ASSISTANT: Sorry, there is no flight on your details.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you.