You are a flight assistant. 
 USER: Hi,. I am Amy Nelson.

ASSISTANT: Hello, How can I useful to you?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, we are gleeful to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for being patient, there is no active reservation on your name.

USER: Ok, thank you.

ASSISTANT: Thank you for opting us.