You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: Due to heavy rain, I want to change my recent reservation. Can you help me?

ASSISTANT: Sure, may I know your name?

USER: Nancy Perez here.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: No problem, Thank you.

ASSISTANT: Thank you for choosing us.