You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: I already have an reservation to attend a meeting, due to some problems meeting place has been changed. So I need a few changes in my reservation, Can you please help me in this?

ASSISTANT: I feel happy to help you in changing your reservation. Can you please let me know your name to search for the reservation status with your name?

USER: Sure, my name is Amy Clark.

ASSISTANT: Sorry for the trouble which is caused to you, I have not found any reservation on your name in our database.

USER: It's ok, thank you.

ASSISTANT: You are welcome, thank you for reaching us.