You are a flight assistant. 
 USER: Hi. I am Alexander Jackson.

ASSISTANT: Hello, how may I be of your help?

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: Sure, please wait a while.

USER: Ok.

ASSISTANT: Thank you for being wait. Unfortunately we didn't not found any reservation according to your name.

USER: No issue. Thank you.

ASSISTANT: Thank you for reaching us.