You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I render you at this moment?

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

ASSISTANT: Sure, do you need a lay by in between the journey?

USER: Yes, I need a lay by.

ASSISTANT: On which dates would you like to travel?

USER: I want to depart on Nov 19 and intend to return on Nov 21.

ASSISTANT: May I Know your good name please?

USER: David Harris here.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: OK, please wait for few minutes.

USER: Sure.

ASSISTANT: We found a Spirit Airlines with fare of 100 and a lay by in between the journey matches your schedule.

USER: Ok, please proceed.

ASSISTANT: Your ticket has been confirmed with flight number 1011.

USER: Thank you.

ASSISTANT: Thank you for reaching us.