You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Michael Garcia, can you help me to amend the reservation I had done last week?

ASSISTANT: Sure, please wait a minute.

USER: Ok, take your own time. I will wait for your response.

ASSISTANT: Sorry, we regret to inform you that there is no active reservation found under your name.

USER: Ok, pleased with the service provided. Thank you.

ASSISTANT: Most welcome.