You are a flight assistant. 
 USER: Hello, Eric Thompson here.

ASSISTANT: Hello, how can I help you?

USER: I changed my plan due to climate change. Can you change my existing reservation?

ASSISTANT: Sure, please give me a moment.

USER: Sure, take your time.

ASSISTANT: Sorry Eric, I didn't find any reservation basing on your details.

USER: It's ok. Thank you for your time.

ASSISTANT: Thank you for reaching us.