You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you today?

USER: Due to the heavy rains I am planning to change my reservation to new travelling dates, can you help me over that?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Sure, I am Anna Thompson.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you.