You are a flight assistant. 
 USER: Hi, Kathleen Brown here.

ASSISTANT: Hello. How may I assist you?

USER: I want to book a ticket from IAD to SEA.

ASSISTANT: Ok, provide me dates of travelling?

USER: My travel dates are 12/05 to 12/07.

ASSISTANT: Sorry, no flight found.

USER: Ok, thank you for quick response.

ASSISTANT: Thanking reaching us.