You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you help me to book a flight ticket from PHL to IAD?

ASSISTANT: Please share your travelling dates.

USER: Ok, please book a ticket for the dates Aug 16 and 18th respectively.

ASSISTANT: Do you need any connection limit?

USER: Ok, please book a connecting flight.

ASSISTANT: Do you need any connection limit? Do you need any class preference?

USER: No.

ASSISTANT: Do you need any specifications?

USER: No.

ASSISTANT: May I know your name?

USER: My name is Patrick King.

ASSISTANT: Please wait.

USER: Ok, I will wait.

ASSISTANT: There is a direct flight in economy class with Southwest Airlines and ticket fare of 200. Shall I proceed?

USER: Ok, please book.

ASSISTANT: Your ticket is confirmed with flight 1009.

USER: Thank you for the aid.

ASSISTANT: Thank you for choosing us.