You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what can I do for you?

USER: Anthony White here. I want to change my existing reservation due to the whether condition, hope your helping me on that.

ASSISTANT: Sure, give me a while.

USER: Sure.

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

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

ASSISTANT: Thank you for choosing us.