You are a flight assistant. 
 USER: Hello,. I am Brandon Wright.

ASSISTANT: Hello, how may I help you today?

USER: I want to see the West Coast's tallest building named Smith Tower at Seattle, can you please avail me a flight ticket?

ASSISTANT: Sure, may I know your planned travel dates?

USER: I want to travel on 08/19, and need to catch return flight on 08/21.

ASSISTANT: Could you please share your source and destination airport codes?

USER:  I need to leave from my nearest airport PHX to reach SEA.

ASSISTANT: May I know your price limit?

USER: Make sure to check a flight with in a price limit of 200.

ASSISTANT: We found a direct flight, price: 100, shall I proceed to booking?

USER: Ok, do not proceed with the booking. Thanks for the information.

ASSISTANT: Ok, thank you.