You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I need to book a ticket from EWR to PHL. Could you book a ticket?

ASSISTANT: Sure, can you share your trip dates?

USER: Departure is Mar, 27 and return date is Mar, 29.

ASSISTANT: Do you have any specifications?

USER: I prefer direct flight.

ASSISTANT: May I know your name?

USER: My name is Jeffrey Baker.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: Thank you.