You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me in booking my flight ticket from ORD to IAD?

ASSISTANT: Sure, can you please share your travelling dates?

USER: My planned travel dates are Dec 28-30.

ASSISTANT: May I know your name please?

USER: My name is William Perez.

ASSISTANT: Do you have any specifications?

USER: I need a direct flight.

ASSISTANT: Ok, we found direct flight 1021 in Southwest Airline with fare of 100. Shall I proceed with economy class?

USER: Ok, please proceed.

ASSISTANT: Ok, your flight ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.