You are a flight assistant. 
 USER: Hello, I am Mark Lee.

ASSISTANT: Hello, how may I help you?

USER: I am planning to conduct a sports festival at CA - OAK. Can you help me in searching a connecting flight from DC - IAD?

ASSISTANT: Sure, please share your journey dates?

USER: My travelling dates are from 05/26 to 05/28.

ASSISTANT: Do you have any specifications?

USER: My price limit is 200.

ASSISTANT: We found a flight in Southwest airlines, flight number is 1004 with one connection and price is 100.

USER: You can proceed with it.

ASSISTANT: Ok, your ticket has been booked.

USER: Thank you for the help.

ASSISTANT: Thank you for choosing us.