You are a flight assistant. 
 USER: Hello. Ruth Roberts here.

ASSISTANT: Hello, how can I help you?

USER: I want to book a ticket from SFO to LAS for a marriage function.

ASSISTANT: Ok, could you please provide your travelling dates?

USER: My travelling dates are from 05/31 to 06/02.

ASSISTANT: Sorry, no flights found as per your information.

USER: That's ok. Thank you for your help.

ASSISTANT: Thank you.