You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you help me to change my reservation which was done two days ago?

ASSISTANT: Sure, I am here to help you. May I know your name to check the reservation list?

USER: Thank you. My name is Benjamin Smith.

ASSISTANT:       Ok, please wait a minute I will get back to you with the present status.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry no reservation found on your name.

USER: Ok, thank you for the information.

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