You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

USER: I am Frank Campbell. I want to visit to an Freedom Park in Charlotte with my friends, can you aid for booking a flight ticket with the price limit of 5000?

ASSISTANT: Please provide your journey dates?

USER: Sure, my travelling dates are from 09/09 to 09/11.

ASSISTANT: To check the availability of flights may I know your airport codes?

USER: Ok, my source is AZ - PHX and destination is NC - CLT.

ASSISTANT: We are sorry to inform you that there is no flights found in your journey dates.

USER: Ok, no problem.

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

USER: Thanks for your information.