You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I need to travel Denver, can you please reserve flight ticket from LAX and DEN?

ASSISTANT: Sure, I will help you. Please help me with your planned travelling dates.

USER: My journey dates are Feb,11 and Feb,13.

ASSISTANT: Please help me with your name.

USER: Gregory Phillips.

ASSISTANT: Do you need a break in your journey?

USER: Yes, I prefer one connecting flight.

ASSISTANT: Do you have any other preference in your journey?

USER: No.

ASSISTANT: Gregory Phillips, I am really sorry to inform you that there are no flights available for your journey.

USER: That's ok, I will choose any other source to reach my destination.

ASSISTANT: Thank you for reaching us. Have a great time.