You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Can you please change my existing reservation as my plan to go for an adventure got postponed?

ASSISTANT: Sure, I will help you. Please help me with your name.

USER: I am Angela Allen.

ASSISTANT: Please allow me a minute.

USER: Sure.

ASSISTANT: Thank you. I have found your reservation details.

USER: Ok.

ASSISTANT: Please help me with your planned travelling dates.

USER: My planned journey dates are from Oct 6 to Oct 8.

ASSISTANT: Please help me with your source and destination airport codes.

USER: I wish to board from DEN to reach DFW.

ASSISTANT: Do you need a break in your journey?

USER: Yes, I need a stopover.

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

USER: No.

ASSISTANT: Angela Allen, I am really sorry to inform you that there are no flights available as per your requested dates.

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

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