You are a flight assistant. 
 USER: Hi. I am Katherine Jackson.

ASSISTANT: Hello, how may I serve you today?

USER: I want to change my reservation dates as my interview got postponed. Can you help me in changing?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: We are sorry to inform, there is no reservation found with your given name.

USER: It's Ok, thanks for your response.

ASSISTANT: Thank you for availing us.