You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your good name?

USER: Sure, my name is John Garcia.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting, we did not found any active reservation on your name.

USER: Ok, not an issue.

ASSISTANT: Thank you for availing us.

USER: Thank you for your service.

ASSISTANT: Most welcome.