You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: Can you please book a flight ticket from DEN to LAS?

ASSISTANT: Sure, We are here to help you.

USER: Thank you.

ASSISTANT: Can I know your travelling dates?

USER: Yes, my travelling dates are Apr 23 and Apr 25.

ASSISTANT: Do you need any break?

USER: Yes, I need a break in between the journey.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: May I know your name?

USER: My name is Angela Turner.

ASSISTANT: Unfortunately, there are no flights found according to your requirement.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for reaching us.