You are a flight assistant. 
 USER: Hello Rachel Robinson here.

ASSISTANT: Hello, how can I assist you?

USER: I want to book a ticket from LAS to IAX. Airport codes are LAX to LAX.

ASSISTANT: Can you provide your journey details?

USER: My preferable journey dates are 03/11 to 03/13.

ASSISTANT: Rachel, no flight is found.

USER: Ok, thank you for your service.

ASSISTANT: Thank you.