You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I best serve you today?

USER: I would like to travel from SFO to LAS, can you please help me in flight booking?

ASSISTANT: Sure, please share me your trip dates.

USER: I want to fly on July 27, return on July 29.

ASSISTANT: Is there any class preferences for you?

USER: No.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I need a connecting flight.

ASSISTANT: May I know your good name?

USER: My name is Ronald Clark.

ASSISTANT: Please share me your other specifications.

USER: I do not have any other requirements.

ASSISTANT: We found a UA airline and 1019 is flight number with a fare of 100. Shall I proceed?

USER: Ok, proceed to booking.

ASSISTANT: Your ticket is confirmed with an economy class.

USER: Thank you.

ASSISTANT: Thank you for opting us.