You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you?

USER: I am Catherine Harris. I want to book a flight ticket within 200.Can you help me with this booking?

ASSISTANT: Sure, can you share your journey dates?

USER: 05/09 and 05/11 are my travelling dates.

ASSISTANT: May I know your journey airport codes for booking?

USER: OAK and CLT are my comfortable airport codes.

ASSISTANT: There is a connecting flight with number 1019 in airline Spirit, the fare is 100.

USER: You can reserve it for me.

ASSISTANT: Your ticket is confirmed.

USER: Thank you for assisting me.

ASSISTANT: Thank you for opting us.