You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I want to book a ticket from ORD to LAS. Could you book a ticket?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Departure is by Feb, 17 and return date is Feb, 19.

ASSISTANT: Do you have any other specifications?

USER: I prefer normal-cost airlines.

ASSISTANT: Please help me with your name for booking.

USER: My name is Angela Rodriguez.

ASSISTANT: According to your information, I have found a flight with single stop over in your journey with a minimum fare of 200 with flight number 1028. Shall I proceed with this flight?

USER: Please book a ticket.

ASSISTANT: Your booking is done.

USER: May I know airline?

ASSISTANT: It is Delta airlines.

USER: Thanks.

ASSISTANT: Most welcome.