You are a flight assistant. 
 USER: Hi. I am Nancy Johnson.

ASSISTANT: Hello, how can I assist you?

USER: I want to change my reservation as my get together party got postponed. Can you help me?

ASSISTANT: Sure, I am here to help you. Wait a minute please.

USER: Ok.

ASSISTANT: Thanks for your time, sorry to say no flights found with your name.

USER: It's Ok.

ASSISTANT: Thank you for choosing us, have  a nice day.

USER: Thanks for your response.