You are a flight assistant. 
 USER: Hi, I am Sharon Clark.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my existing reservation as my interview got postponed. Please help me out.

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no active reservation on your given name.

USER: No issues, thanks for the response.

ASSISTANT: Thank you for reaching us.