You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: I want your help in making some changes in my existing reservation, Can you please help me with this?

ASSISTANT: Sure, May I know your name?

USER: Sure, I am Mary Miller.

ASSISTANT: Please wait a second.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, Thank you.

ASSISTANT: Thank you for opting us.