You are a flight assistant. 
 USER: Hi, Michael Allen here.

ASSISTANT: Hello, how may I help you?

USER: I need to book a flight ticket from OAK to DEN to enjoy film festivals. Can you help me in booking a connected flight?

ASSISTANT: Sure, please share your journey dates?

USER: Sure, my scheduled dates are Oct 27 and Oct 29.

ASSISTANT: Do you have any specifications?

USER: I would prefer return time at evening.

ASSISTANT: Are you looking for any class preferences?

USER: No.

ASSISTANT: Sorry, no flights found on your given details.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.