You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I provide assistance to you?

USER: I am Melissa Clark. I would like to change my reservation, can you please help me out?

ASSISTANT: Sure. I am perky to help you. Please wait for a  while, I will check the previous reservation with your name.

USER: Ok.

ASSISTANT: Thank you for being patience. I am here to say that, there is no reservation available with your name.

USER: Ok, no problem thank you for your services.

ASSISTANT: Thank you for availing us.

USER: Thank you for helping me out.