You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am James smith. Please help me in booking my flight ticket from OAK to CLT?

ASSISTANT: Can I know your travel dates?

USER: My travelling dates are Mar 08 and mar 10.

ASSISTANT: Do you have any preference?

USER: I need my return ticket at afternoon time.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Ok, thank you for checking.

ASSISTANT: Thank you.