You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Jacob Adams.

ASSISTANT: How can I aid you today?

USER: Can you please help me in booking my flight ticket from DEN to CLT?

ASSISTANT: May I know your travel dates?

USER: My travelling dates are Nov 21 and Nov 23.

ASSISTANT: Do you have any preferences?

USER: I need my return flight at evening time.

ASSISTANT: Sorry, we couldn't found any flights for you.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for reaching us.