You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, welcome to Blue Agency. How can I help you?

USER: I am Gray Thompson. There is one reservation on my name to Charlotte, my plan to visit Charlotte is postponed. Can you change my journey date?

ASSISTANT: Sure, I am glad to help you. Sorry to tell that there is no reservation on your name.

USER: Thanks for the information.

ASSISTANT: Thank you for approaching us.