You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ronald Hall.

ASSISTANT: How may I assist you?

USER: I want to change my existing reservation, due to heavy rainfall in Seattle, can you help me in changing?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Give me a minute to check your previous reservation.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found under your name.

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

ASSISTANT: Most welcome.