You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I want to book a ticket from LAS to BOS to meet my parents, can you help me?

ASSISTANT: Sure, please tell me your planned travelling dates.

USER: My travel dates from 08/07 to 08/09.

ASSISTANT: Ok, may I know your name please?

USER: Myself Patrick Phillips.

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

USER: No problem, thanks for your help.

ASSISTANT: Thank you.