You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you now for today?

USER: I want to book a ticket form LAS to LAX, can you help me?

ASSISTANT: Sure, can you please mention the travelling dates of your journey?

USER: My travel dates are 12/15 and 12/17.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: May I know your name please?

USER: Myself Betty Taylor.

ASSISTANT: sorry, there are no flights found on your requested dates.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for approaching us.