You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I want to change my existing reservation due to sudden change in my trip dates. Can you help me with that?

ASSISTANT: Sure, we are here to help you to change it. To proceed further, may I know your name?

USER: Thank you. I am Virginia Parker.

ASSISTANT: Thanks for your name, please wait.

USER: Sure.

ASSISTANT: Thanks for your time, there was no reservation found on your name to change it.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.