You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I am Patrick Campbell. Can you book a ticket with price limit 500?

ASSISTANT: Sure, I will help you. Please share me your travelling details?

USER: I would like to go for Rolling Pub Detroit, my journey dates are from 05/11 to 05/13. My airport codes are from DEN to DTW.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting.

USER: Ok.

ASSISTANT: We are sorry to inform you that no flights were available based on your schedule.

USER: Not an issue. Thank you for your help.

ASSISTANT: Thanks for choosing us, have a great day.