You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Kathleen Carter.

ASSISTANT: Do you want me to help you with anything?

USER: I want to change existing reservation, due to the heavy rains. Can you help me?

ASSISTANT: Sure, I will help you that. Give me a second.

USER: Ok.

ASSISTANT: I am sorry to say that there is no reservation found on your name.

USER: It's ok, thank you for searching.

ASSISTANT: Thank you for your contacting us. Have a nice day.