You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. In which way I can aid you at this moment?

USER: I want to change my existing reservation which is done recently due to some problems, can you please help me in this?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: May I know your name for further process?

USER: Sure, my name is Samuel Rodriguez.

ASSISTANT: Ok, please hold on a moment, I will check your reservation status.

USER: Sure, I will wait.

ASSISTANT: There is no previous reservation available under your name.

USER: Ok, no problem. Thank you for your service.

ASSISTANT: Thank you for contacting us, have a good day Samuel Rodriguez.