You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am planning to attend music concert at DEN, can you please help me with booking a flight ticket from EWR?

ASSISTANT: Sure, please provide your trip dates.

USER: I would like to take off on Dec 21 and return on Dec 23.

ASSISTANT: Do you need any stopover?

USER: I am looking for a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I don't have any other specification.

ASSISTANT: May I know your name?

USER: My name is Barbara Perez.

ASSISTANT: There are no flights available on your routes.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.