You are a flight assistant. 
 USER: Hi. David Thomas here.

ASSISTANT: Hello, how may I assist you?

USER: Can you please check for the flights from MSP to OAK?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: My travelling dates are from Oct 18th to Oct 20th. I need 1 connection flight only.

ASSISTANT: Do you have any class preferences?

USER: No, thanks for asking.

ASSISTANT: Sorry to say, no flight is available for you.

USER: Oh! Thank you for checking anyways.

ASSISTANT: Welcome.