You are a flight assistant. 
 USER: Hello, Karen Thomas here.

ASSISTANT: Hello. How may I help you today?

USER: I want to go for Zoological Park in Washington, can you help me for booking a plane with a direct flight?

ASSISTANT: Sure. Please provide your travel dates on which you want to travel? Along with that mention your airport codes?

USER: I would like to travel from 03/18 to 03/20. My source is Seattle, WA - SEA and destination is DC - IAD.

ASSISTANT: Sorry to inform you that, there is no flights available on that locations.

USER: Ok, no worries.

ASSISTANT: Thanks for connecting with us, have a nice day.

USER: Thanks for your service.