You are a flight assistant. 
 USER: Hello.

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

USER: I want to change my travel dates, due to some health problems I am unable to travel those dates, can you please change my reservation?

ASSISTANT: May I know your name to proceed further?

USER: Thank you, my name is Stephanie Garcia.

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

USER: Ok.

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

USER: Oh! It's ok no problem. Thank you for your information.

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