You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, please share your planned trip dates?

USER: I want to travel on 05/14, and need to catch return flight on 05/16.

ASSISTANT: Ok, let me know your boarding and landing airport codes?

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

ASSISTANT: Ok, no flights found with your requested details.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for reaching us.