You are a flight assistant. 
 USER: Hi, I am Benjamin parker.

ASSISTANT: Hello, how may I assist you?

USER: Due to the sudden change in climate, my meeting with client has been postponed. Can you please change my existing reservation?

ASSISTANT: Sure, please wait for a minute.

USER: Sure.

ASSISTANT: There is no reservation found with your name.

USER: Ok, no worries at all.

ASSISTANT: Thank you for choosing us.

USER: Thanks for your service.