You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Nancy Lewis. I need to change my reservation due to my planned event got postponed. So please help me with that.

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: Thank you. I have changed my travel dates as 11/08 and 11/10.

ASSISTANT: Nancy Lewis, we haven't found any reservation under your name to change.

USER: Oh! It may not be booked properly due to server issues. Anyway, thank you for your time.

ASSISTANT: Thank you for approaching us.

USER: Most welcome.