You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to change my existing reservation because I had booked with wrong destination code. Can you please help me to change previous reservation?

ASSISTANT: Sure, I will help you on that.

USER: Thank you for noting down my concern.

ASSISTANT: Please mention the name for checking your reservation.

USER: My name is Helen Perez.

ASSISTANT: Please give me a moment.

USER: Ok, sure.

ASSISTANT: There is no reservation found under your name.

USER: Ok, it might be done by my mother. Anyway thank you for the information.

ASSISTANT: Welcome, have a great day.