You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. Can I know your name?

USER: I am Raymond Moore.

ASSISTANT: How can I aid you?

USER: I want to book a flight ticket to Oakland on 01/21 to attend world health conference, can you please help me in booking?

ASSISTANT: Sure, I can help you with this booking. Can I know your travelling airport codes?

USER: My source airport code is MN-MSP and my landing point is CA-OAK.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a break.

ASSISTANT: Please provide me your return date.

USER: I intend to return on 01/23.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Thanks for being patient. Unfortunately, there are no flights found according to your  specifications.

USER: That's ok. Thanks for your information.

ASSISTANT: Thank you for opting us.