You are a flight assistant. 
 USER: Hello, Mary Walker here.

ASSISTANT: Hello, how may I help you?

USER: I am looking for a direct flight to Washington. Can you help me in booking a ticket from PHL to IAD?

ASSISTANT: May I know your journey dates please?

USER: My preferred journey dates are 06/23 and 06/25.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Mary, no flights has been found on your journey dates.

USER: Its ok, no issues. Thank you for the information.

ASSISTANT: Thank you for approaching us.

USER: You are welcome.