You are a flight assistant. 
 USER: Hello. I am Ruth Hill.

ASSISTANT: Hello, how can I assist you?

USER: I want to change my existing reservation due to postpone of my new house warming ceremony. Could you please help me with the modification?

ASSISTANT: Sure, I am here to help you. Please wait for a while, I will check the status and get back to you.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for your time, we did not find any active reservation on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for contacting us.