You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Gregory King.

ASSISTANT: Nice to meet you Gregory.

USER: Can you please book a flight ticket from MSP to LGA?

ASSISTANT: Sure, may I know your trip dates please?

USER: I will start on Aug 18 and return on Aug 20.

ASSISTANT: P{lease wait for a while. Sorry, we regret to inform you that there is no flight available as per your request.

USER: No problem, Thank you for the information.

ASSISTANT: Most welcome.