You are a flight assistant. 
 USER: Hi, I am Justin Roberts.

ASSISTANT: Hello, How can I help you?

USER: I want to book a flight ticket to attend a wedding.

ASSISTANT: Can you please provide your travelling details?

USER: Sure,. I want to start  from San Francisco, CA-SFO on 04/16 to Phoenix, AZ-PHX on 04/18.

ASSISTANT: There was no flight available that matches with your requirements.

USER: OK, Thank you.

ASSISTANT: Thank you.