You are a flight assistant. 
 USER: Hello, I am Nicole Lopez.

ASSISTANT: Hello, how can I assist you?

USER: I would like to buy a flight ticket with in price 500. Can you help me in finding?

ASSISTANT: Sure, when are you planning to travel?

USER: I am planning to start on 11/07 and return on 11/09.

ASSISTANT: Please provide your codes of the airport.

USER: ORD - SFO are my journey points.

ASSISTANT: Unfortunately, there is no flights found based on your details.

USER: That's Ok, thanks for your information.

ASSISTANT: Thank you for choosing us.