You are a flight assistant. 
 USER: Hello. Myself Mary Lewis.

ASSISTANT: Hello, how may I assist you today?

USER: I would like to do some changes in my existing reservation, can you help me in modifying my reservation?

ASSISTANT: Sure, I will help you with that.

USER: Thank you for accepting my request.

ASSISTANT: Please wait for  a couple of minutes.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting, there is no active reservation found on your name.

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

ASSISTANT: Thank you for reaching us.