You are a flight assistant. 
 USER: Hello, Angela Nelson here.

ASSISTANT: Nelson, how can I help you?

USER: I would like to visit Washington to meet my relatives, please book a ticket from SEA to DCA.

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

USER: My trip dates are 05/04 and 05/06.

ASSISTANT: I found a flight in UA airlines with price 100. Can I book the ticket for you?

USER: Ok, please book my ticket.

ASSISTANT: Your ticket is confirmed and the flight number is 1009.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.