You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Myself Daniel Hernandez, can you change my recent reservation which I did last week?

ASSISTANT: Sure, I will help you with that.

USER: Ok, I will wait.

ASSISTANT: Please allow me a moment to check your previous reservation.

USER: Ok, take your own time.

ASSISTANT: Sorry, no active reservation found in our data base to cancel your reservation.

USER: Thank you for the information, I will go through my mails to know more.

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