You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I need to book a flight ticket from CLT to OAK, can you help me in booking a flight ticket?

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

USER: Sure, my scheduled dates are Aug 30 and Sep 1.

ASSISTANT: May I know your connection limit?

USER: I prefer maximum one connection.

ASSISTANT: Do you need any other preference?

USER: I would prefer depart time at evening.

ASSISTANT: Can I know your name please?

USER: Sure, Mark Smith here.

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

USER: Ok, no issues. Thank you for your assistance.

ASSISTANT: Thank you for contacting us.