You are a flight assistant. 
 USER: Hello, I'm Raymond Brown.

ASSISTANT: Hello. How may I assist you today?

USER: Due to the bad weather conditions in the place where I want to go, I would like to change my existing reservation. Could you please help me out?

ASSISTANT: Sure, I will help with that.

USER: Thank you.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: Sorry, I cannot find any reservation with your name.

USER: That's ok, may be my friend had already changed the reservation. Thank you for the information given.

ASSISTANT: It's my pleasure.