You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Laura Nelson here. Due to sudden change in climate, I want to change my existing reservation. Can you please help me with this?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please wait a moment, I will check the reservation data list.

USER: Sure.

ASSISTANT: Sorry Laura Nelson, there is no reservation on  your name.

USER: Ok, no problem.

ASSISTANT: Thank you.

USER: Thanks for your help.