You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am William Clark. Can you help me in booking from OAK to BOS?

ASSISTANT: William Clark, can I know your travelling dates please?

USER: My travelling dates are 10/31 to 11/02.

ASSISTANT: Ok, wait for a moment till I check with flight availability.

USER: Sure.

ASSISTANT: Sorry to inform you William Clark, but there is no flight on your requested dates.

USER: No issue, thank you for your time.

ASSISTANT: Thank you for approaching our agency. Have a nice day.