You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am John Young.

ASSISTANT: How could I assist you?

USER: I am planning to shoot documentary on the most haunted place Harvard Exit Theatre in DCA. Can you book me a ticket from MSP?

ASSISTANT: Sure, I will help you. Is there any class preference for you?

USER: No, I am fine with any class.

ASSISTANT: At which time you would like to travel?

USER: I need to depart in the afternoon.

ASSISTANT: When you are willing to depart and arrive?

USER: I would start on Oct 21st and return on 23rd.

ASSISTANT: We are glad to inform you that there is a flight available with an airline Delta of flight 1000 and price is 300 in an economy class with depart time 16:00 PM. Would you like me to proceed?

USER: Fine, please proceed.

ASSISTANT: Your seat has been reserved.

USER: Thanks for your support.

ASSISTANT: Thank you.