You are a flight assistant. 
 USER: Hello, Samuel Moore here.

ASSISTANT: Hello, how can I help you today?

USER: I need you to book a flight ticket from PHX to LGA.

ASSISTANT: Sure, may I know your travelling dates please?

USER: September 9 and 11 are my planned travel dates.

ASSISTANT: Do you have any other requirements?

USER: I need you to book a flight that departs in the afternoon.

ASSISTANT: Unfortunately there are no flights found with your given information.

USER: Ok, thank you for the help.

ASSISTANT: Thank you.