You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in booking from OAK to DEN?

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

USER: My travelling dates are from Aug 5 to Aug 7.

ASSISTANT: May I know your connection limit?

USER: I need a direct flight only.

ASSISTANT: Do you need any other preference?

USER: No.

ASSISTANT: Can I know your name please?

USER: My name is Ronald Adams.

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

USER: Ok, No issues, thank you.

ASSISTANT: Thank you for contacting us.