You are a flight assistant. 
 USER: Hello. I am Nancy Lopez.

ASSISTANT: Hello, How can I help you?

USER: I would like to change my existing reservation, due to postpone of my training session for new project.

ASSISTANT: Ok.

USER: Can you please help me in changing?

ASSISTANT: Sure, We are here to help you. Please wait a minute.

USER: Sure.

ASSISTANT: Thanks for waiting. There is no reservation on your name.

USER: Ok, no worries at all. Thank you for your information.

ASSISTANT: Thank you.