You are a flight assistant. 
 USER: Hello, I am David Evans.

ASSISTANT: Hello, how may I help you today?

USER: I want to book a ticket under price 1000, Can you please book a ticket for me?

ASSISTANT: Sure, can you please share your journey dates?

USER: My depart is on 05/29 and return is on 05/31 with 1 connection.

ASSISTANT: Ok, can I have your airport codes?

USER: Origin: PHX and Destination: ORD.

ASSISTANT: Do you have any other restrictions to be met? Ok, please wait a moment, let me search a flight for you.

USER: Sure.

ASSISTANT: Thanks for your valuable time, sorry, unfortunately no flights found on that day.

USER: Ok. Thank you.

ASSISTANT: Thanks for opting us, have a great day ahead.