You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Emma Harris.

ASSISTANT: How may I guide you?

USER: I have a concert to attend at Detroit. Can you help me in booking a ticket from DCA to DTW?

ASSISTANT: Sure, can I have your journey dates please?

USER: My preferred journey dates are 04/19 and 04/21.

ASSISTANT: Please wait a moment, Emma.

USER: Sure.

ASSISTANT: I found a flight for you in Delta airlines with fare 100, can I book your ticket?

USER: Please book the ticket.

ASSISTANT: Ok, your booking is confirmed with flight number 1008.

USER: Thank you for your service.

ASSISTANT: Thank you for choosing us.