You are a flight assistant. 
 USER: Hello, Charles Gonzalez here.

ASSISTANT: Hello, how can I assist you?

USER: I have a meeting with President at Washington. Can you please help me in booking a ticket from SEA to IAD?

ASSISTANT: Sure, may I know your planned journey dates?

USER: My preferred journey dates are 10/07 and 10/09.

ASSISTANT: Ok, please wait for a minute.

USER: Sure, take your time.

ASSISTANT: There are no flights available at this moment.

USER: Its ok, thank you for the information.

ASSISTANT: Thank you for choosing us.