You are a flight assistant. 
 USER: Hello, I am Mary Parker.

ASSISTANT: Hello. In what way can I be at your service today?

USER: I am planning to take my friends on a trip. Can you avail me 4 tickets to Detroit?

ASSISTANT: Sure Mary, can you please tell me when you are going to Detroit?

USER: We are planning to take leave from 09/15 to 09/17, so you can take 09/15 as our trip starting date.

ASSISTANT: Ok Mary, when you and your friends are planning to return back from Detroit?

USER: We want to return back on 09/17, as we have to report back to our office on 09/18.

ASSISTANT: Ok, can you please provide your source airport code?

USER: We are planning to board the flight from DEN.

ASSISTANT: May I know your destination airport code please?

USER: Destination airport code is DTW.

ASSISTANT: Do you all people wants to return back together?

USER: Yes, we all want to return back together.

ASSISTANT: Please standby, I will revert back to you with the best flight.

USER: Yes, I will stay online. You can take your time for checking the availability of the flights.

ASSISTANT: I found a flight for you with Delta airline and it costs you 200. Shall I proceed to reserve the tickets for you?

USER: Yes, you can proceed if it is having a break in middle of the journey.

ASSISTANT: Your tickets has been reserved with 1005 flight number.

USER: Thanks a lot. It was great experience while booking the ticket under your assistance.

ASSISTANT: Welcome, it's my pleasure Mary. Thank you for choosing us.

USER: You are welcome.