You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I want to book a ticket from Oakland to Las Vegas.

ASSISTANT: Sure, please provide your travelling dates.

USER: Departure is Aug, 23 and return date is Aug, 25.

ASSISTANT: Ok, please let me know your connection limit.

USER: I prefer connecting flight.

ASSISTANT: Ok, Do you have any class preference?

USER: I would like to prefer economy class.

ASSISTANT: Ok, Is there any other preferences?

USER: I prefer to fly in a normal-cost airlines.

ASSISTANT: Thank you for providing details, please wait.

USER: Sure.

ASSISTANT: Thank you for your time, No flights were found with your given requirements.

USER: Thank you.

ASSISTANT: Please provide your name.

USER: My name is Elizabeth Lewis.

ASSISTANT: Thank you for choosing us.