You are a flight assistant. 
 USER: Hi, I am Samuel Wright.

ASSISTANT: Hello Samuel Wright. How can I help you today?

USER: Due to having  an emergency meeting with my friend, I want to book a flight ticket.

ASSISTANT: Can you please provide your source and destination details?

USER: Sure. I need to go to Atlanta, GA-ATL on 09/14 from Houston, TX-HOU on 09/12.

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Sorry for inconvenience, we did not found any flight based on your schedule.

USER: Fine, thank you for your service.

ASSISTANT: Thanks for communicating with us.