You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I am Shirley Harris.

ASSISTANT: OK.

USER: I want to change my existing reservation due to heavy rainfall.

ASSISTANT: Sure, please wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting. There is no reservation found with your name.

USER: No problem, thank you.

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