You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Please help me to book a flight ticket from Oakland to meet my old friend in Seattle.

ASSISTANT: Can I know your travelling dates?

USER: I need to start my journey on 01/01 and my return date will be on 01/03.

ASSISTANT: Is there any connection limit?

USER: I prefer to fly in connecting flight.

ASSISTANT: Let me know your airport codes.

USER: My boarding point is OAK and my destination point is SEA.

ASSISTANT: Do you have any preference?

USER: No.

ASSISTANT: Let me know your name.

USER: I am Dennis Campbell.

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

USER: That's ok, No problem.