You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I need to change my existing reservation as I plan to go for a holiday trip got postponed. Can you please help me with this?

ASSISTANT: Sure, can I have your name please?

USER: My name is Betty Lewis.

ASSISTANT: Ok, please wait for a while.

USER: Sure, make it fast.

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

USER: Not  a problem, thanks for checking.

ASSISTANT: Thank you for opting us.