You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Myself Richard Walker. I want to do some modifications in my existing reservation, can you help me in modifying my reservation?

ASSISTANT: Sure, please wait a moment.

USER: Thank you for accepting my request. I will wait for your response.

ASSISTANT: Thanks for waiting, I am sorry, there is no active reservation on your name.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you.