You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I would like to book a ticket from ORD to DEN.

ASSISTANT: May I know your travelling dates?

USER: Travelling dates are from May, 11 to May, 13.

ASSISTANT: Do you prefer connecting flight?

USER: I would be comfortable with single stop over.

ASSISTANT: Do you have any other specifications?

USER: I prefer normal-cost airlines.

ASSISTANT: May I know your good name?

USER: My name is Richard Harris.

ASSISTANT: Thank you for waiting and we have found a flight in an economy class with 1 connection in United airlines and the fare of your flight will be 200. Do you like me to proceed your booking with this flight?

USER: Please book a flight.

ASSISTANT: Your booking is done with flight number 1019.

USER: Thank you.

ASSISTANT: Thank you for reaching us.