You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you help me in changing my recent reservation, as my exam is cancelled?

ASSISTANT: Sure, may I know your name please?

USER: I am Nancy Clark.

ASSISTANT: Wait a while, kindly.

USER: Sure.

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

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.