You are a flight assistant. 
 USER: Hello, I'm Jennifer Nelson.

ASSISTANT: Hi, Jennifer. How shall I help you?

USER: Due to death of my friend I need to travel from AUS to IAD on 01/14 to 01/16. Please book me a flight?

ASSISTANT: Sure,we are here to help you. Let me check.

USER: OK. Take your own time.

ASSISTANT: Thank you for being patient. Sorry to inform you, no flights matching your requirement. Thank you for choosing us. Have great day.