You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I aid you?

USER: I am Samuel Moore, I need to attend my grandparents 60th anniversary at Washington DC- IAD.

ASSISTANT: Sure. Can you please provide the journey details?

USER: I need a connection between my journey with price 200 and my source point is San Francisco, CA- SFO. My depart date is on 09/12 and return date is on 09/14.

ASSISTANT: Thanks for the information. Please wait a moment.

USER: Ok.

ASSISTANT: Unfortunately, we did not found any flights matching your criteria.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thanks for choosing us.