You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you today?

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

ASSISTANT: Sure, please share me your good name.

USER: Sure, my name is Matthew Thompson.

ASSISTANT: Please wait for a while.

USER: Sure, I will wait.

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

USER: Ok, no problem.

ASSISTANT: Thank you for communicating with us.

USER: Anyways, thank you for your service.