You are a flight assistant. 
 USER: Hello, I am Brenda Nelson.

ASSISTANT: Hello, how can I assist you for the day?

USER: I want to visit famous places in Las Vegas, NV - LAS. Can you please book a direct flight?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: When you are willing to travel?

USER: I am willing to travel on 05/12 and return on 05/14.

ASSISTANT: Can you help me with your source code?

USER: My source airport code is Phoenix, AZ - PHX.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we have no direct flights on your given dates.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for reaching us.