You are a flight assistant. 
 USER: Hello. I am Jack smith.

ASSISTANT: Hello, how can I aid you today?

USER: I want to attend a music festival at Los Angeles. Can you book a flight ticket from DEN to LAX?

ASSISTANT: Sure, when are you planning to travel?

USER: I will start on Oct, 4 and return on Oct, 6.

ASSISTANT: Do you need a halt?

USER: Yes, I need a halt.

ASSISTANT: Do you have any other specifications?

USER: Make sure that my return time must be at morning.

ASSISTANT: Thank you for your details, there are no flights found with given details.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you.