You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to book a flight ticket from NY-EWR to CA-SFO. Could you help me with booking under a fare 500?

ASSISTANT: Sure, may I know your planned journey dates?

USER: My preferable journey dates are 04/01 to 04/03.

ASSISTANT: May I know your name please?

USER: I am Ashley Green.

ASSISTANT: Sorry, no flights found with your given details.

USER: Ok, not an issue.

ASSISTANT: Ok, thank you for opting us.

USER: Thank you.