You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Can you book a flight ticket in direct flight for my journey?

ASSISTANT: Sure, may I know your airport codes?

USER: Thank you so much and my desired airport codes are EWR and LAS.

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: Ok, my travelling dates are Mar 7 and return on Mar 9.

ASSISTANT: Do you have any requirements?

USER: I have mentioned that I need a direct flight.

ASSISTANT: Can I know your name?

USER: Sure, my name is Debra Phillips.

ASSISTANT: Sorry to say, no flight is available for you.

USER: Not a problem, I can search for any other source. Thank you for your help.

ASSISTANT: Thank you for reaching us.