You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, How may I assist you today?

USER: Can you please book a flight ticket on 09/18 and return on 09/20?

ASSISTANT: Sure, I will check the flights accordingly. Can you please share the travel airport codes?

USER: My airport codes are LAX - DFW.

ASSISTANT: Please share your name to proceed further.

USER: I am Barbara Thompson.

ASSISTANT: May I know your fare limit?

USER: I can afford up to 200 only.

ASSISTANT: Ok. Thanks for sharing your details.

USER: Ok.

ASSISTANT: But we found a flight with a cost of 600, which does not matches your request.

USER: Please, do not proceed. Thanks for your help.

ASSISTANT: Thanks for choosing us, Have a great day.