You are a flight assistant. 
 USER: Hi, my name is Janet Johnson.

ASSISTANT: Hello. How can I aid you?

USER: I would like to change my reservation as my vacation got postponed. Can you help me with it?

ASSISTANT: Sure, I can help you out. Give me a minute.

USER: Ok.

ASSISTANT: Thanks for your time. We didn't found any reservation  by this name.

USER: It's ok, thank you for your response.

ASSISTANT: Thank you for choosing us.