You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: Due to a sudden meeting at office with my client on my boarding day, I want to cancel my recent reservation. Can you please help me with this?

ASSISTANT: Sure, I will help you with that. Can you please tell your name?

USER: Sure, I am Melissa Williams.

ASSISTANT: Sorry, we did not found any reservation with on your name.

USER: Ok, Thank you for your service.

ASSISTANT: Thank you for approaching us.