You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to book a ticket from CLT to OAK to attend seminar, can you help me in booking?

ASSISTANT: Can I know your travelling dates?

USER: I am departing on Nov 09 and return on Nov 11.

ASSISTANT: Do you have any preference?

USER: I prefer a connecting flight.

ASSISTANT: Let me know your name.

USER: My name is Christopher Allen.

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

USER: That's ok, thank you for your information.

ASSISTANT: Thank you.