You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: I want to book a ticket from DCA to PHX, can you help me?

ASSISTANT: Sure, may I know your trip dates?

USER: My travel dates are 11/29 and 12/01.

ASSISTANT: Do you need a single connecting flight?

USER: I prefer a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your good name, please?

USER: I am Linda Roberts.

ASSISTANT: Sorry, currently there are no flights available on your travel dates.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for choosing us.