You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you for the day?

USER: Dennis Miller here. I would like to book a ticket from DCA to PHX, can you please help me with that?

ASSISTANT: Sure, we are here to help you. When are you planning to start and return on?

USER: The travel dates are from 11/20 to 11/22.

ASSISTANT: Do you need a connecting flight?

USER: I need a flight with 1 connection limit.

ASSISTANT: In which class do you want to travel?

USER: No, but I would like to return during evening time.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, there are no flights found with the given details.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for choosing us.