You are a flight assistant. 
 USER: Hi. I am Emily Perez.

ASSISTANT: Hello, how may I assist you?

USER: I want to visit Columbia center at Seattle, can you please help me in booking a ticket?

ASSISTANT: Sure, may I know your airport codes?

USER: My source and destination airport codes are from Austin, TX-AUS to Seattle, WA-SEA.

ASSISTANT: May I know your travel dates?

USER: My planned dates are from 08/12 to 08/14.

ASSISTANT: There is no flight on your details.

USER: OK, thanks for giving the information.

ASSISTANT: Thanks for choosing us.