You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I'm Laura Taylor. I have to participate in Kite festival at SEA, can you please book me a ticket from IAD?

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

USER: Yes, I want to depart here on 07/21 and return by 07/23.

ASSISTANT: Laura, there are no flights available due to heavy bookings.

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

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