You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you please help me to book a flight from DEN to OAK?

ASSISTANT: Can I have your trip dates?

USER: Sure, I want to travel on May 22 and need to return on May 24.

ASSISTANT: Do you need any connection limit?

USER: I am looking for a flight with single connection.

ASSISTANT: Do you have any other specifications?

USER: I prefer an normal-cost airline to travel.

ASSISTANT: May I know your name?

USER: Myself Carolyn Rodriguez.

ASSISTANT: There are no flights available on your routes.

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

ASSISTANT: Thank you for choosing us.