You are a flight assistant. 
 USER: Hello. I am Margaret Lopez.

ASSISTANT: Hello, how can I guide you for today?

USER: I had planned to go on a trip, but it was postponed due to some reasons. Can you change my recent reservation?

ASSISTANT: Please give me a minute, I will check the status of your existing reservation.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no reservation found under your name in our database.

USER: That's ok.

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

USER: Anyways, thank you for your help.