You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I would like to change my flight reservation as my trip got postponed, can you please help me?

ASSISTANT: Sure, please let me know your good name.

USER: My name is Charles Martin.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, we did not find any active reservation on your name in our data.

USER: Not an issue, thank you for the information.

ASSISTANT: Thank you for opting us.