You are a flight assistant. 
 USER: Hello, Nicole Harris here.

ASSISTANT: Hello, how may I guide you?

USER: My friend has invited to attend his convocation ceremony at Detroit. Can you help me in booking a ticket from CLT to DTW?

ASSISTANT: Sure, may I know your journey dates please?

USER: I would like to travel on 07/28 and return on 07/30.

ASSISTANT: I found a flight for you in UA airlines with price 100. Shall I book your ticket?

USER: Please book the ticket.

ASSISTANT: Ok, your booking is confirmed with flight number 1022.

USER: Thank you for your service.

ASSISTANT: Thank you for choosing us.