You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Jessica Perez. Can you please reserve me a flight ticket from EWR to PHL?

ASSISTANT: May I know your desired travel dates please?

USER: My trip dates are 04/18 - 04/20.

ASSISTANT: Do you have any specifications?

USER: My return time should be in the afternoon with a direct connection.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Not a problem, thank you.

ASSISTANT: Thank you for your help.