You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: John Miller here. Please help me out in booking the ticket from LGA to BOS.

ASSISTANT: May I know your desired travel dates please?

USER: My planned trip dates will be 08/09 to 08/11.

ASSISTANT: Please wait a while.

USER: Sure, take your time.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: That's ok, anyways thank you.

ASSISTANT: Thank you for opting us.