You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Larry Thompson.

ASSISTANT: How can I assist you today?

USER: Please help me in booking from SEA to IAD.

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: My travelling dates are from Aug 27 to Aug 29.

ASSISTANT: May I know your class preference please?

USER: I am comfortable with any class.

ASSISTANT: Do you have any time concerns?

USER: My return time is afternoon.

ASSISTANT: Please let me know if you have any other specifications.

USER: I need a connecting flight.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates with your given details.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for choosing us, have a nice day.