You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, welcome to flight ticket booking agency.

USER: I am Karen Johnson.

ASSISTANT: How can I assist you, Karen?

USER: I am planning to attend a birthday party in Phoenix.Can you help me out to book a ticket?

ASSISTANT: Sure Karen, I'm glad to help you. Could you please provide me your journey dates?

USER: There are my travelling dates are 08/21 to 08/23.

ASSISTANT: Do you have any airport preferences?

USER: My source and destination is DTW to PHX.

ASSISTANT: There is a flight with Southwest airlines available with price 100. Shall I book the ticket for you?

USER: Please proceed the booking.

ASSISTANT: Your ticket is confirmed and the flight number is 1007. Thank you for choosing our services.

USER: Thank you for your service.

ASSISTANT: You are welcome.