You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Angela Martinez. I am planning to travel on these days that is on Aug 30 and return on Sept 01. Can you make a reservation for me?

ASSISTANT: Sure, I am gleeful to help you. Could you please provide your travelling airport codes to search for the flight?

USER: Thank you, my airport codes are from CLT to BOS.

ASSISTANT: May I know your class preference please?

USER: Yes, I need a business class.

ASSISTANT: Do you have any other specifications please?

USER: Yes, I want to depart in the morning time and returning in the afternoon time.

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

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: You are welcome.