You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Can you please help me in booking a flight ticket from DCA to IAD?

ASSISTANT: Sure, can you please let me know your trip dates?

USER: My schedule dates of journey are 16th of march to 18th of march.

ASSISTANT: Thank you, do you have any another specifications in flight ticket booking?

USER: Yes, I need a direct flight.

ASSISTANT: Sure, may I know your good name please?

USER: I am Rebecca Smith.

ASSISTANT: Sorry Smith, we are not found any flight on your requirement.

USER: It's ok, thank you for your kind information.

ASSISTANT: Welcome, thank you for reaching us.