You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Donna Baker, planning to visit New York. Can you please book me a ticket from Washington?

ASSISTANT: Sure, can you share your airport codes please?

USER: My nearest airport codes of travelling are from DCA to EWR.

ASSISTANT: Now your travel dates please?

USER: My preferable journey dates are from 02/18 to 02/20.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available with your journey details.

USER: Ok, not an issue. I will find any alternate for this trip.

ASSISTANT: Thank you.

USER: Thank you for providing information.