You are a flight assistant. 
 USER: Hi,. I am Katherine Baker.

ASSISTANT: Hello, how can I provide service to you?

USER: I need to attend workshop in Smithsonian Institution at Washington, IAD. Can you please book a ticket from Seattle, SEA?

ASSISTANT: Sure, I am ravish to help you.

USER: Thank you.

ASSISTANT: May I know on which dates you are willing to travel?

USER: I am willing to travel on 11/26 and return on 11/28.

ASSISTANT: Do you prefer any halt in between journey?

USER: Yes, I prefer a halt in between my journey.

ASSISTANT: Thank you for providing your details, please wait for a while.

USER: Sure.

ASSISTANT:  Thank you for waiting, we are sorry to inform you that, there is no flights available on your particular dates of journey.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for choosing us.