You are a flight assistant. 
 USER: Hi. I'm Paul Garcia.

ASSISTANT: Hello, how may I assist you?

USER: I want to attend a branch meeting at Philadelphia. Can you please book a plane ticket with a price limit of 1000?

ASSISTANT: May I know your travelling dates please?

USER: I need a direct flight. I would like to depart on 09/19 and return on 09/21.

ASSISTANT: Could you please provide me your airport codes please?

USER: My origin is AZ - PHX and destination is PHL.

ASSISTANT: Thanks for giving your details, unfortunately there is no direct flight on your details.

USER: Ok, no problem. I will go with another option.

ASSISTANT: Thanks for choosing us.

USER: Thanks for your service.

ASSISTANT: Have a good day.