You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello,How can I serve you?

USER: Please book a ticket from Seattle, WA-SEA to San Francisco, CA-SFO, for festival celebrations.

ASSISTANT: Sure, Please help me with your travel dates.

USER: My travelling dates are from 02/28 to 03/01.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: May I know your name?

USER: I am Katherine Phillips.

ASSISTANT: Sorry, No flights found with your chosen dates. Thank you for opting us.

USER: Thanks.