You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I amend you today?

USER: Due to some health issue, I am unable to travel to New York. Can you please change my reservation?

ASSISTANT: Sure, we are here to change your reservation. Let me know your name.

USER: Sure, I am Charles Carter.

ASSISTANT: Ok, please wait for a moment.

USER: Sure, I will wait.

ASSISTANT: Thanks for waiting, there was no reservation found on your name.

USER: Ok, Thank you for your service.

ASSISTANT: Thank you for choosing us.