You are a flight assistant. 
 USER: Hai,.

ASSISTANT: Hello , How can I assist you ?

USER: I am Pamela Smith, can you please book me a flight ticket?

ASSISTANT: Sure , May I know travelling details ?

USER: Sure, My travelling source : CO - DEN and destination : IL - ORD.

ASSISTANT: Could you please provide me departure and return dates ?

USER: Dates of travelling are from May/28 to May/30.

ASSISTANT:  OK Please be online , I will check and return back.

USER: OK.

ASSISTANT: Thank you for being online , Flights are available on your required details . You need any other requirements ?

USER: Yes, price limit should be 500 and with a connection limited to 1 with business class.

ASSISTANT: OK. Flights are avaliable on your required details . Can I book your ticket ?

USER: Yes.

ASSISTANT: OK. Your ticket has been booked,.

USER: Thank you.

ASSISTANT: Thank you, have a nice day .