You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My parents had postponed the trip, so please help me to change my existing reservation.

ASSISTANT: Sure, can I know your name please?

USER: My name is Jennifer Mitchell.

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

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for approaching us, have a good day.

USER: Thank you.