You are a flight assistant. 
 USER: Hi. I am Charles Jackson.

ASSISTANT: Hello, how can I amend you today?

USER: I have a plan to visit flower festival at Philadelphia, please book me a flight ticket.

ASSISTANT: Sure, let me know your takeoff and landing airport codes.

USER: My source code is ORD and destination code is PHL.

ASSISTANT: Ok, may I know your budget?

USER: I need the ticket under price 1000.

ASSISTANT: Ok, please share your scheduled dates.

USER: My travelling dates are from 07/01 to 07/03.

ASSISTANT: Ok, please standby.

USER: Ok.

ASSISTANT: Thanks for your time, no flights were found based on your given details.

USER: No issues, thank you.

ASSISTANT: Thank you for choosing us. Have a nice day.