You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, good morning.

USER: Good morning.

ASSISTANT: I hope you are doing good today, how can I help you?

USER: I am planning to visit Washington, DC-IAD to meet my sister.Can you please help me out?

ASSISTANT: Sure. From where you are travelling to Washington?

USER: I want to travel from Seattle, WA-SEA.

ASSISTANT: Sure, On what dates you are willing to travel?

USER: The travelling dates are from 08/20 to 08/22.

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

USER: Sure.

ASSISTANT: There is no flight between Seattle to Washington on 08/20.

USER: Ok, no problem. I will check another flight.

ASSISTANT: Sure, for documentation purpose, may I know your name please.

USER: My name is Richard Perez. Thank you for your information.

ASSISTANT: Thank you Richard Perez for reaching us. Have a nice day.

USER: Thank you.