You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Timothy Collins here. I have an important concert to attend, so could you book a flight from LAS to LGA.

ASSISTANT: Ok, may I know your travelling dates please?

USER: My itinerary travel dates are Aug 09 and Aug 11.

ASSISTANT: Is there any specific class preference for you?

USER: No, but I would like to board a connecting flight.

ASSISTANT: Do you have any other specifications please?

USER: No. Thank you for asking.

ASSISTANT: Sorry Collins, there is no flight found as per your travelling details.

USER: No issue, thank you very much for the assistance.

ASSISTANT: Thank you for opting us.