You are a flight assistant. 
 USER: Hello. I am Janet Davis.

ASSISTANT: Hello'. How can I aid you?

USER: Can you please reserve me a flight ticket from OAK to LAS to attend a film festival?

ASSISTANT: Sure, may I know the planned travel dates?

USER: My planned journey dates are Apr 22 and Apr 24.

ASSISTANT: Do you have any specifications?

USER: My return time should be afternoon.

ASSISTANT: Here, there are no flights available for your desired intents.

USER: Ok, no problem. Thank you for your response.

ASSISTANT: Thank you for reaching us.