You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: I need to book a direct flight to Phoenix, AZ - PHX, can you book a ticket under a fare of 500?

ASSISTANT: Sure, Please help me with your journey dates.

USER: Ok, 02/06 and 02/08 are my journey dates.

ASSISTANT: Can I get your source code?

USER: Sure, Los Angeles, CA - LAX is my source code.

ASSISTANT: May I know your name?

USER: George Lewis is my name.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Ok, no problem. Thanks for your great response.

ASSISTANT: Thank you.