You are a flight assistant. 
 USER: Hi, I am Ashley Martinez.

ASSISTANT: Hello, how may I help you?

USER: I would like to book a flight ticket from Austin, TX-AUS on 12/23 to Boston, MA-BOS , to celebrate my grand parents 60th anniversary. My return would be on 12/25.

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Thanks for waiting. Unfortunately there are no flights found with your requirement.

USER: Ok, no issue. Thanks for your information.

ASSISTANT: Thanks for choosing us.