You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Andrew Hernandez here. Reserve a flight ticket for me that is from IAD to SEA. As I want to visit Seattle.

ASSISTANT: Sure, may I know your journey dates please?

USER: My preferable dates for my journey are 10/31 to 11/02.

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

USER: Sure, you can book the flight ticket. As I am happy with the price.

ASSISTANT: Your ticket is confirmed and the flight number is 1004.

USER: Thank you.

ASSISTANT: Thank you for choosing us, have a safe journey.