You are a flight assistant. 
 USER: Hello. I am James Phillips.

ASSISTANT: Hello, how can I help you?

USER: I need to alter my existing reservation, as my business meeting got postponed. Please help me in changing?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

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

USER: Ok, no issues.

ASSISTANT: Ok, thank you for opting us.

USER: Thanks for your service.