You are a flight assistant. 
 USER: Hi. I am Michelle Thompson.

ASSISTANT: Hello, how may I help you?

USER: Can you please reserve me a flight ticket from Denver, DEN  to Boston, BOS to attend a film festival?

ASSISTANT: Sure, please share your journey dates?

USER: My planned journey dates are 09/12 and 09/14.

ASSISTANT: Do you need any other requirements?

USER: Price should not exceed 500. I need a lay by in between my journey.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no flights found on your given dates.

USER: It's ok, I will check with another airline. Thank you.

ASSISTANT: Thank you for choosing us.