You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist you today?

USER: I need to change my existing reservation, as my exam got postponed. Please help me in changing?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: I made a reservation on the name of Paul Adams.

ASSISTANT: Thanks for your name, please wait.

USER: Ok.

ASSISTANT: Thank you for waiting, no reservation was found on your name to cancel.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for choosing us.