You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Brian Moore. Can you please help me in booking a flight ticket from DEN to CLT?

ASSISTANT: Sure, please provide me your planned travel dates.

USER: I would like to fly on Oct 31 and return on Nov 02.

ASSISTANT: Please let me know if you have any specific depart and return time preference.

USER: I would like to return in the afternoon time.

ASSISTANT: Sure, do you have any other preference?

USER: I need a single connection.

ASSISTANT: Sorry, currently we don't have any flight running between given route from you.

USER: Not an issue. Thank you.

ASSISTANT: Thank you.