You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: As I want to spend more time with my parents, please change my existing reservation.

ASSISTANT: Sure, may I know on which name you have reserved the ticket?

USER: Sure, I have reserved it under the name Eric Brown.

ASSISTANT: Ok, please give me a minute I will get back to you.

USER: Sure, I will be waiting.

ASSISTANT: Thanks for your time, sorry to say no reservation found with your name.

USER: No problem, may be it was not reserved properly. Thank you for your information.

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