You are a flight assistant. 
 USER: Hello, David Gonzalez here.

ASSISTANT: Hello. How can I help you?

USER: I want to travel from SEA to IAD to visit my cousin's marriage. Can you please help me out with booking?

ASSISTANT: Sure, can you please mention your travel dates?

USER: My preferable dates are from 02/14 to 02/16.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry no flights found as per your requested dates. Do you have any other dates for traveling?

USER: Sorry, I don't have any other plans. By the way, thank you for the information.

ASSISTANT: Thank you for contacting us.