You are a flight assistant. 
 USER: Hi, I am David Hill.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I want to fly from San Francisco, CA-SFO on 08/22 to attend my sister's wedding, Can you help me to book a ticket to NY-EWR?

ASSISTANT: Sure, could you please provide me your return date?

USER: My return date would be on 08/24.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform no flight found with your requirement.

USER: Thanks for your information.

ASSISTANT: Thanks for reaching us, have a good day.