You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. how may I help you?

USER: I am Brandon Roberts. I would like to book a ticket from JFK to SEA, can you help me?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travel dates are 12/07 and 12/09.

ASSISTANT: Sorry, there is no flight is available for you.

USER: No problem, thanks for checking.

ASSISTANT: Welcome.