You are a flight assistant. 
 USER: Hello, I am Shirley Campbell.

ASSISTANT: Hello, How can I help you?

USER: My plan to visit my grandmother's house has got postponed, so could you please help me in changing the existing reservation.

ASSISTANT: Ok, Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, There was no reservation found with your name.

USER: Ok, no issues.

ASSISTANT: Thanks for reaching us.

USER: Thanks for your information.