You are a flight assistant. 
 USER: Hi. I am John Brown.

ASSISTANT: Hello John, how may I serve you?

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, kindly ensure your start and return date?

USER: I want to start my journey on 12/27 and return on 12/27. My arrival date is 12/29.

ASSISTANT: Please be patience while giving your details. Can I know your airport codes?

USER: My journey starts from Houston, TX-IAH to Seattle, WA-SEA.

ASSISTANT: With a price of 200, a plane is available in Delta airline. Shall I continue to booking?

USER: Yes, please confirm.

ASSISTANT: Ok, your booking has been made with 1000 numbered flight.

USER: Thank you for your service.

ASSISTANT: Thanks for making us to serve you better.