You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I wanted to change my reservation due to my planned programme got postponed. Can you help me is there any chance to change my reservation.

ASSISTANT: Sure, please wait a moment I will revert you back with your status of reservation.

USER: Ok.

ASSISTANT: Ok, may I know your name to check the status.

USER: Please check with the name of Steven Brown.

ASSISTANT: Thanks for your patience,there is no reservation found under your name to change it.

USER: It's ok, anyway thanks for your help.

ASSISTANT: Thanks for consulting us.