You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How could I serve you today?

USER: I am planning to attend music concert at JFK, can you please help me with booking a flight ticket from DEN?

ASSISTANT: Sure, to reserve a ticket can I know your travelling dates?

USER: I would like to take off on Jan 8 and return on Jan 10.

ASSISTANT: Do you have any other requirements?

USER: I would like to return during evening time.

ASSISTANT: Please provide your name.

USER: My name is Eric Moore.

ASSISTANT: We are sorry to inform you that there is no flight available with your given information.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you.

USER: You are welcome.