You are a flight assistant. 
 USER: Hello.

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

USER: Could you book my ticket from DCA to PHX?

ASSISTANT: Sure, please share me your trip dates.

USER: My trip dates are May 1 and May 3.

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 airline preferences?

USER: I prefer normal cost airlines.

ASSISTANT: For booking, we need your good name. Please provide it.

USER: Catherine Lewis here.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.