You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Dennis Lopez.

ASSISTANT: How may I assist you?

USER: I want to change my reservation, can you help me for that?

ASSISTANT: Ok, please wait for a while let me check the status of your reservation.

USER: Ok, please check.

ASSISTANT: I am appreciating your patience, there is no reservation found under your name.

USER: That's ok, thank you for checking.

ASSISTANT: Ok, thanks for choosing us.

USER: Welcome.