You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Deborah Phillips here. I want to celebrate my birthday at Las Vegas, please book my ticket from Washington DC.

ASSISTANT: Ok,please provide me your trip dates.

USER: My itinerary dates are Feb 26 and Feb 28.

ASSISTANT: Ok, do you have any preferences in class?

USER: No.

ASSISTANT: Can you please provide me your destination and source codes again.

USER: I want to travel from DCA to LAS.

ASSISTANT: Do you require any connections between your journey.

USER: I prefer a connecting flight.

ASSISTANT: Ok, do you have any other preferences?

USER: I prefer to travel in normal-cost airlines.

ASSISTANT: Ok, let me check availability according to your requirements.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no flight going on your way.

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us.