You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I would like to change my existing reservation, can you help me in that?

ASSISTANT: May I know your name to check your reservation?

USER: Sure, myself Michael Hill.

ASSISTANT: Ok, please wait.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for waiting, I have gone through the reservation list twice but could not find any reservation active under your name.

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

ASSISTANT: Thanks for consulting us.