You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: Sarah Martin here. I am looking for a flight with price below 200. Can you book the flight ticket?

ASSISTANT: Yes, can you share me your travelling dates?

USER: Sure. My travelling dates will be 01/09 to 01/11..

ASSISTANT: Ok, could you tell me your nearest airport codes?

USER: My airport codes for boarding the flight are ATL to SFO.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: Ok, not a problem. I will check for other airlines.

ASSISTANT: Thank you for contacting our agency.

USER: Thank you.