You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I'm Angela Carter, want to travel from SEA to SFO. Can you book my ticket?

ASSISTANT: Sure, may I know your travelling dates please?

USER: My travelling dates are from 08/22 to 08/24.

ASSISTANT: Sorry, there is no flight available as per your requested dates.

USER: That's fine. Thank you for the information.

ASSISTANT: My pleasure.