You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Larry Parker. Can you please help me in booking my flight ticket from SEA to SFO?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My travelling dates are July 30 and Aug 01.

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

USER: Ok, fine thank you for checking.

ASSISTANT: You are welcome.