You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to book a flight from DEN to reach PHL. Can you help me?

ASSISTANT: Sure, may I know your planned travel dates?

USER: I will fly on Feb 02 and return on Feb 04.

ASSISTANT: May I know your connection limit?

USER: I prefer a direct flight.

ASSISTANT: Do you have any other specifications?

USER: I want my return flight in evening.

ASSISTANT: May I know your good name?

USER: My name is Shirley Hill.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.