You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am Michael Turner. I want to book a flight ticket with a price limit of 500. I need a direct flight to attend my Granny's funeral in Phoenix.

ASSISTANT: Ok, may I know your journey dates?

USER: My departure is 05/22 and my return on 05/24.

ASSISTANT: Can you please provide me your source and destination airport codes?

USER: My origin from TX - IAH and my destination to AZ - PHX.

ASSISTANT: Please wait for a moment, I will check and get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry, there is no flights found with your given details.

USER: Not an issue. Thanks for your service.

ASSISTANT: Thanks for choosing us.