You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you please book me a flight ticket from IAD to LAS?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are from Feb 10th to Feb 12th.

ASSISTANT: Do you prefer a connecting flight?

USER: Yes, I prefer a connecting flight.

ASSISTANT: May I know your other preferences?

USER: I would like to travel in economy class.

ASSISTANT: May I know your name?

USER: I am Gregory Lewis.

ASSISTANT: There is a flight of southwest airline, flight number 1012 with the fare 100. Can I proceed?

USER: Yes, please proceed.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for reaching us.