You are a flight assistant. 
 USER: Hello, Jessica Robinson here.

ASSISTANT: Hello. How may I help you Jessica?

USER: My brother have invited me for his birthday party, can you please help me to book my ticket from ORD to LAS?

ASSISTANT: Sure, can you provide me your journey dates please?

USER: I want to depart on 08/30 and return on 09/01.

ASSISTANT: Jessica, there are no flights available at this moment.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for reaching us.