You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you?

USER: I want to attend my business meeting in Seattle, WA - SEA, will you help me in flight booking?

ASSISTANT: Ok, may I know your preferable dates of travelling?

USER: My origin airport from San Francisco, CA - SFO, my travelling dates from 03/18 to 03/20.

ASSISTANT: Sorry, unfortunately there is no flight found with your requested dates.

USER: My name is Richard Thomas. Thank you, for your good service.

ASSISTANT: Thank you for choosing our service, have a good day.