You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Edward Wilson from Las Vegas. Can you please book a flight ticket from LAS to DCA?

ASSISTANT: Sure Wilson, please provide me your journey dates.

USER: Thank you for your positive response, I want to take off on 05/20 and please confirm my return ticket also on 05/22.

ASSISTANT: Please wait for a minute.

USER: Ok.

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

USER: Please proceed.

ASSISTANT: Your ticket is confirmed and the flight number is 1001.

USER: Thank you for your service.

ASSISTANT: Thank you for contacting us.