You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: Nicole Parker here. I would like to book a ticket from DCA to SEA, can you please help me with that?

ASSISTANT: Sure, we are glad to help you. Please kindly share your travel dates.

USER: The travel dates are from 04/30 to 05/02.

ASSISTANT: Sorry, there are no flights on your given route.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for choosing us.