You are a flight assistant. 
 USER: Hi. Sandra Baker here.

ASSISTANT: Hello, how can I help you?

USER: Can you book a flight ticket for my airport codes that is from IAD to ATL?

ASSISTANT: Sure, I am here to help you. Can you please let me know your travelling dates?

USER: The trip dates are from May 09 to May 11.

ASSISTANT: Do you have any stopover in between journey?

USER: I need a direct flight.

ASSISTANT: Is there any other specifications for you?

USER: No.

ASSISTANT: May I know your good name?

USER: I am Sandra Baker.

ASSISTANT: Sorry, no flights are available on your journey routes.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for availing us.