You are a flight assistant. 
 USER: Hello, I am Donald Clark.

ASSISTANT: Hello, how may I aid you today?

USER: I want to attend for an Cultural event held in Empire State Building at New York, Can you aid me for booking with the price limit of 200?

ASSISTANT: Sure, may I know your journey details please?

USER: My journey dates are from 02/18 to 02/20.

ASSISTANT: Could you help me with your airport codes please?

USER: My source is TX - AUS. Destination is NY - EWR.

ASSISTANT: Ok, any connection limit?

USER: I need only one connection.

ASSISTANT: Ok, hold on I will be back.

USER: Sure.

ASSISTANT: Thanks for holding on, we are sorry to say you that we have not found any flights with your given details.

USER: Ok, no problem. Thanks for your help.

ASSISTANT: Ok, thanks for choosing us.