You are a flight assistant. 
 USER: Hi, I am Mary Walker.

ASSISTANT: Hello,. How may I help you?

USER: I need to book a flight ticket on 10/29 and return 10/31, can you please help me with it?

ASSISTANT: Sure. Please let me know airport codes?

USER: Sure, my airport codes are CA-OAK and CA-SFO.

ASSISTANT: Ok. Connecting flight 1022 with airline Spirit, for price 200 is available. Shall I book ticket?

USER: please proceed.

ASSISTANT: Your ticket is booked.

USER: Thank you.

ASSISTANT: Thanks.