You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me to book a flight from BOS to CLT?

ASSISTANT: Sure, let me know your trip dates please?

USER: Sure, I want to travel on Apr 28 and need to return on Apr 30.

ASSISTANT: May I know your connection limit?

USER: I am looking for a flight with single connection.

ASSISTANT: Do you need any other preference?

USER: I want to depart in the morning time and need to return in the afternoon time.

ASSISTANT: Can I know your name please?

USER: Donald Thompson here.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

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

ASSISTANT: Thank you for contacting us.