You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Timothy King.

ASSISTANT: How can I  help you?

USER: I would like to travel from IAD to SEA for a event, could you help me in booking a ticket?

ASSISTANT: Your travelling dates please?

USER: Sure, my preferable dates are from 15-17 OCT.

ASSISTANT: I am sorry no flights found on your route.

USER: That's ok. Thank you for your time.

ASSISTANT: Thank you for choosing us.