You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I am Patricia Young, can you please book a ticket from PHL to MSP?

ASSISTANT: Sure, help me with the trip dates?

USER: My trip dates are on Oct 18 and Oct 20.

ASSISTANT: Do you have any preferences?

USER: I need to depart at afternoon and return at afternoon.

ASSISTANT: Sorry, no flights were available at this moment.

USER: Ok, thank you for informing me.

ASSISTANT: Thank you for reaching us.