You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you today?

USER: I am Gregory Carter, can you please help me in  changing my reservation as my plan to visit my grandmother's home got postponed?

ASSISTANT: Sure, wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, sorry to say that, no reservation was found with your good name.

USER: It's ok.

ASSISTANT: Thanks for connecting with us.

USER: Thank you for the information.