You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Mark Wilson here.

ASSISTANT: How can I assist you?

USER: I want to attend my convocation ceremony at Detroit, so please book my ticket from Chicago.

ASSISTANT: Ok, may I know your travelling dates?

USER: My travel dates are 05/26 and 05/28.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: May I know from you want to start your journey and also tell me your destination airport code?

USER: My origin and destination airport codes are ORD and DTW.

ASSISTANT: Ok, here is a flight ticket with fare 100 and 1015 as flight number with single connection flight. Shall I proceed for booking?

USER: Book my ticket.

ASSISTANT: Ok, your ticket is confirmed.

USER: Thank you.

ASSISTANT: Thank you for reaching us.