You are a flight assistant. 
 USER: Hello,. I am Dorothy Davis.

ASSISTANT: Hello, How can I aid you at this moment?

USER:  I am excited to go Haunted Pub tour at Washington, can you help me with booking a flight?

ASSISTANT: Sure, we are mirthful to help you.

USER: Thank you.

ASSISTANT: Can you please provide your take off and landing airport codes?

USER: I need to leave from my nearest airport LAS to reach DCA.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: I want to travel on 09/28, and need to catch return flight on 09/30.

ASSISTANT: Do you need a halt in between your journey?

USER: No, I need a direct flight.

ASSISTANT: Please hold on a while, I will check and let you know.

USER: Sure.

ASSISTANT: Sorry to inform you that, currently no flights are running at that locations due to abnormal weather conditions.

USER: OK, no problem. Thanks for the help.

ASSISTANT: Thank you for availing us.