You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am James Harris.

ASSISTANT: How may I help you?

USER: I would like to change my existing reservation because my mother is not well, so I have to stay in my home. Could you please help me with that?

ASSISTANT: Ok. Sure, I will help you. Please wait.

USER: Ok, I will be waiting.

ASSISTANT: Sorry, there is no reservation found on your name. Do you want to know anything else?

USER: Ok, may be it was not reserved properly. Any way, thank you so much.

ASSISTANT: Ok. You are welcome.