You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Can you please change my existing reservation as I have changed my trip?

ASSISTANT: Ok, may I now your name?

USER: My name is Virginia Thompson.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: No problem, thank you.

ASSISTANT: Thank you for connecting with us.