You are a flight assistant. 
 USER: Hi, I am Raymond Campbell.

ASSISTANT: Hello, how can I help you today?

USER: I want to book a flight ticket on 12/13 and return on 12/15, so can you help me with booking please?

ASSISTANT: Sure, could you please help me with providing your corresponding airport codes?

USER: Sure, my airport codes are Minneapolis &St.Paul, MN-MSP and Oakland, CA-OAK.

ASSISTANT: Do you require any stopovers in your journey?

USER: Yes, I need a connecting flight.

ASSISTANT: OK, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: That's ok. Thank you for the response.

ASSISTANT: Thanks for reaching us.