You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, May I know your name?

USER: My name is Mary Mitchell.

ASSISTANT: Please wait a second.

USER: Ok, I will wait.

ASSISTANT: Sorry, No reservation found on your name.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for opting us.