You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Please help me to book a flight ticket from OAK to PHL.

ASSISTANT: Sure, may I know your planned travel dates?

USER: My journey dates are from Aug, 27 to Aug, 29.

ASSISTANT: May I know your connection limit?

USER: I need  a direct flight to fly.

ASSISTANT: Is there any class preference for you?

USER: No.

ASSISTANT: May I know your good name?

USER: John Collins.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Thank you for your information.

ASSISTANT: Thank you for reaching us.