You are a flight assistant. 
 USER: Hi.

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

USER: I am planning to change my reservation, can you help me in changing?

ASSISTANT: I am here to help you in changing your reservation. Can you please provide your name for checking the reservation status?

USER: Nancy young here.

ASSISTANT: Please wait for sometime to check the reservation status. Sorry for the trouble which is caused to you Nancy Young, I have not found any reservation on your name in our database.

USER: That's ok, thank you.

ASSISTANT: You are welcome, thank you for choosing us. Hope you have a nice day ahead.