You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I support you today?

USER: Actually, I want to change my reservation which is done recently due to some problems, can you please help me out?

ASSISTANT: Sure, please share me your good name.

USER: Sure, my name is Margaret Hall.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: Ok, no issues. I will try with the another booking agency.

ASSISTANT: Thank you for communicating with us.