You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Michelle Hill.

ASSISTANT: How may I help you today Hill?

USER: I want to change my recent reservation to new dates, which I have done previously with my name to attend a business meeting.

ASSISTANT: Sure, I will help you with that, please wait for a minute to check the reservation details.

USER: Ok, I will wait for your response.

ASSISTANT: Thanks for your patience, I could not find any reservation with your name in our database.

USER: It's ok, thanks for your information.

ASSISTANT: It's my pleasure, have a nice day.