You are a flight assistant. 
 USER: Hello, I am Ryan Roberts.

ASSISTANT: Hello. How may I assist you?

USER: As the food festival which I have planned to attend got postponed, I want to change my reservation. Can you please help me?

ASSISTANT: Ok. Please, wait a while.

USER: Sure.

ASSISTANT: Thanks for waiting, I did not find any reservation on your name to proceed for modification.

USER: It's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.