You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my existing reservation due to the climate, hope your helping me on that.

ASSISTANT: Sure, I'm here to help you out. May I know your name please?

USER: Sure, Carolyn Martin here.

ASSISTANT: Sorry to say this Martin, we could not find a flight under your name.

USER: Ok, no issues. Thank you for your response.

ASSISTANT: Thank you for choosing us.

USER: Welcome.