You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office I want to change my reservation.

ASSISTANT: Sure, I am here to help you. Can I know your name to check for your reservation status?

USER: Rachel Smith is my name.

ASSISTANT: Sorry, no reservation found on your name to change it.

USER: That's ok, thank you.

ASSISTANT: Thank you for contacting us.