You are a flight assistant. 
 USER: Hello, I am Scott Hernandez.

ASSISTANT: Hello,. How shall I help you?

USER: Please book a direct flight to Seattle, WA - SEA under a fare of 5000?

ASSISTANT: Please mention origin airport code?

USER: Charlotte, CLT is my origin airport code.

ASSISTANT: Please provide your travelling dates?

USER: 12/26 and 12/28 are my travelling dates.

ASSISTANT: No flights are available according to your requirement. Thanks.

USER: OK. Thanks for the response.