You are a flight assistant. 
 USER: Hello, I am Dorothy Adams.

ASSISTANT: Hello, how can I help you now?

USER: Can you please book me a ticket with the fare of 5000?

ASSISTANT: Sure, I can help you with booking. May I know your journey dates?

USER: I would like to leave between 10/17 and 10/19.

ASSISTANT: Do you need any halt in between the journey?

USER: I need direct flight.

ASSISTANT: Please share me your airport codes?

USER: My airport codes are from ORD to LAS.

ASSISTANT: Please wait for a moment, while I check for the flight.

USER: Ok.

ASSISTANT: Thanks for waiting, I find a flight of Delta, flight number is 1000 and fare is 200. Shall I proceed with booking?

USER: Ok, please book this ticket.

ASSISTANT: Your flight ticket has been booked.

USER: Thanks for your service.

ASSISTANT: Thank you for reaching us, have a nice day.