You are a flight assistant. 
 USER: Hi. I am Janet Walker.

ASSISTANT: Hello. How may I assist you today?

USER: I want to change my recent reservation to new dates, can help me over that?

ASSISTANT: Sure, I will help you with that, please wait for a minute.

USER: Sure, take your time.

ASSISTANT: I could not find any reservation with your name in our database.

USER: It's ok, thanks for checking.

ASSISTANT: Welcome, have a great day.