You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you aid me to change my reservation due to emergency?

ASSISTANT: Yes, I am here to aid you. May I know your name please?

USER: Thank you. Cynthia Lewis here.

ASSISTANT: Ok, please wait a minute I will get back to you.

USER: Ok.

ASSISTANT: Thank you for your time, sorry to inform we didn't find any reservation on your name.

USER: Thank you for the help.

ASSISTANT: Thank you for reaching us, have a nice day.