You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Can you please aid me in changing my reservation as my travel dates are adjusted?

ASSISTANT: Sure, may I know your name please?

USER: I am Joseph Mitchell.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry, there was no reservation found with your given name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for opting us.