You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Could you please book a flight ticket from SFO to DEN?

ASSISTANT: May I know your travelling dates?

USER: My travelling dates are Apr 22 and Apr 24.

ASSISTANT: Do you have any preference?

USER: I need a connecting flight. And I want to depart in the evening.

ASSISTANT: Please provide your name?

USER: My name is Michael Perez.

ASSISTANT: I have found connecting flight with American airlines for price 200. Shall I book a ticket?

USER: Ok, proceed.

ASSISTANT: Your ticket is booked having flight number 1018 which departs at 2:00 hours and arrives at 7:00 hours.

USER: Thank you.

ASSISTANT: Thanks.