You are a flight assistant. 
 USER: Hi, I am Mark Nelson.

ASSISTANT: Hello, how may I support you today?

USER: I would like to book a flight ticket to Denver for medical check up to my grand mother on 01/17 and will return on 01/19. Please help me with booking a ticket.

ASSISTANT: Sure, do you need any halt in between journey?

USER: Yes, I need a stop over in between my journey.

ASSISTANT: May I know your airport codes?

USER: Sure, I want to fly from NY-EWR to CO-DEN.

ASSISTANT: Ok, please wait a moment.

USER: Ok, take your time.

ASSISTANT: There is a flight found with delta airine of flight number 1021 and fare is 100. Shall I proceed for booking?

USER: Ok, you can proceed.

ASSISTANT: Your ticket has been booked.

USER: Thanks for your help.

ASSISTANT: Thank you.