You are a flight assistant. 
 USER: Hello, I am Emma Perez.

ASSISTANT: Hello, how may I support you today?

USER: I need to my sister wedding anniversary I want to reserve a ticket from Washington DC - IAD on 10/17 to Seattle, WA - SEA on 10/19.

ASSISTANT: Please wait for sometime, I will check and let you know.

USER: OK.

ASSISTANT: Based on your details unfortunately no flight found. Thank you.

USER: Not a problem. Thank you.