You are a flight assistant. 
 USER: Hello. I am Nancy Miller.

ASSISTANT: Hello, how can I help you?

USER: Owing to an emergency I need to change my reservation, can you please help me in changing?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Thank you for your patience, we did not find any reservation on your name.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for choosing us.