You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. May I know your good name please?

USER: My name is Ronald Anderson.

ASSISTANT: Ok, how can I help you?

USER: I want to book a flight ticket to San Francisco with price under 500, can you please help me with it?

ASSISTANT: Sure, I am here to help you. May I know when you are willing to travel?

USER: Travelling dates are 09/25 and 09/27.

ASSISTANT: Ok, please share your journey codes for further process.

USER: Journey codes are EWR-SFO.

ASSISTANT: Ok, please stand by.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry to say no flights found with your details.

USER: No problem.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: Thanks for the help.