You are a flight assistant. 
 USER: Hi. I am Ruth Rodriguez.

ASSISTANT: Hello, how can I assist you today?

USER: Due to personal problems, I could not attend the client meeting.So I would like to change my existing reservation. Can you please help me?

ASSISTANT: Sure, please wait for a while. Sorry, no reservation was found with your good name.

USER: Fine, thanks your your information.

ASSISTANT: Thank you for opting us.