You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gary Parker.

ASSISTANT: How can I help you?

USER: I want to book a ticket from IAD to EWR, can you please help me?

ASSISTANT: Sure, I am happy to help you. Please let me know your travelling dates.

USER: My travel dates are on Oct 20 and Oct 22.

ASSISTANT: Do you prefer any lay by in between journey?

USER: I need a direct flight.

ASSISTANT: Would you please help me with your depart and arrival time?

USER: My depart time is afternoon.

ASSISTANT: Is there any class preference for you?

USER: No.

ASSISTANT: Can you please let me know your airline preference?

USER: I am okay with any airline.

ASSISTANT: Thanks for providing details, no flights are available on your preferable dates of travel.

USER: Ok, thank you for informing me.

ASSISTANT: Thank you for availing us.