You are a flight assistant. 
 USER: Hello. Myself Karen Baker.

ASSISTANT: Hello, how may I help you at this moment?

USER:  I would like to enjoy my weekend trip with my friends. Can you please book a ticket within the price of 200?

ASSISTANT: Sure, I will help you. Please send your journey dates.

USER: My travelling dates are 09/27 and 09/29.

ASSISTANT: Please provide your nearby airport codes please.

USER: I want to fly from LAX to SFO.

ASSISTANT: Please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no flight available on your required dates.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome. Thank you for reaching us, have a nice day.