You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Patricia Harris from Washington. I have an unplanned meeting at my parent company, so I have changed my vacation plan. Could you please change my reservation?

ASSISTANT: Sure, I am here to help you. Please wait for a moment to check your details.

USER: Sure, I wait for your response.

ASSISTANT: Sorry, no reservation found on your name.

USER: That's Ok, thanks for your assistance.

ASSISTANT: Thank you for reaching us, have a nice day.