You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may 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. Can you help me?

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: We are sorry to inform that there is no reservation found with your provided name. Can I know your name please?

USER: Jeffery Lewis here.

ASSISTANT: Thank you for availing us.

USER: Thank you.