You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,.

USER: I am Kathleen White.

ASSISTANT: How exactly can I render you now?

USER: I need to book a flight ticket on 03/23 and return on 03/25, can you help me with booking?

ASSISTANT: Sure, I will help you. May I know your boarding and landing airport codes?

USER: My airport codes are CA-SFO and CA-OAK.

ASSISTANT: Do you need any connection or not?

USER: Yes, I need.

ASSISTANT: Thanks for waiting. We did not find any flights with respect to your routes.

USER: That's ok, thank you.

ASSISTANT: Thanks for approaching us.