You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I be your helping hand today?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can I have your name please?

USER: Sure, my name is Kathleen King.

ASSISTANT: Ok, please wait for a few minutes.

USER: Sure, I will wait.

ASSISTANT: Thank you for waiting, no reservation was found on your name to change.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thank you for availing us.