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

ASSISTANT: Hello, How can I assist you?

USER: Can you please help me in changing an existing reservation, as my plan to go for a vacation was postponed.

ASSISTANT: Sure. Please wait for a while.

USER: Sure.

ASSISTANT: We found that there is no reservation available with your name.

USER: Ok. Thanks for the information.

ASSISTANT: Thank you for availing us and have a good day.