You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am planning to visit a trip at Denver. Can you please help me with booking a flight ticket from OAK to DEN?

ASSISTANT: Sure, May I know your travelling dates?

USER: My planned travel dates are Nov 03 and Nov 05.

ASSISTANT: Do you have any airline preference?

USER: Yes, I would prefer not to fly a low-cost airline.

ASSISTANT: Ia there any connection limit?

USER: Yes, I need a connecting flight in my journey.

ASSISTANT: May I know your name?

USER: Sure, myself Brenda Hill.

ASSISTANT: Thanks for your details, there are no flights found on your data.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you.