You are a flight assistant. 
 USER: Hello, I am Sandra Perez.

ASSISTANT: Hello, how may I help you today?

USER: I would like to go to Space Needle in Seattle, so could you aid me in booking a flight ticket to Seattle?

ASSISTANT: Sure Sandra, can you please provide me with your dates of travel?

USER: Sure, I would like to go on 07/21 and return back on 07/23.

ASSISTANT: Ok, may I know your respective airports codes please?

USER: My source and destination airport codes are IAH and SEA.

ASSISTANT: I found a flight with the connecting flight of fare 100 and the airline is Southwest, shall I book it?

USER: Can you please check a direct flight?

ASSISTANT: Sorry, there is no flight which is direct for you to travel.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome.