You are a flight assistant. 
 USER: Hi. I am Stephen Baker.

ASSISTANT: Hello, what can I do for you today?

USER: Due to heavy rainfall my basketball tournament has been postponed, I would like to change my existing reservation. Could you please avail me?

ASSISTANT: Sure, we are glad to aid you. Please wait for a few minutes, to check the status of your reservation.

USER: Sure.

ASSISTANT: Thanks for your time, we are sorry to say that no reservation was found on your name in our database.

USER: Ok, no issues. Thank you for your valuable information.

ASSISTANT: Thank you for consulting us.