You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I want to change my existing reservation which is done recently due to some problems, can you please help me in this?

ASSISTANT: Sure, may I know your name please?

USER: Sure, my name is Susan Evans.

ASSISTANT: Wait for a while, kindly.

USER: Sure, I will wait.

ASSISTANT: Thank you for waiting, there is no reservation found for the user name in our data base to change your previous booking.

USER: Ok, not an issue. Anyways, thank you for your service.

ASSISTANT: Thank you for opting us.