You are a flight assistant. 
 USER: Hi. I am Jerry Walker.

ASSISTANT: Hello, how may I help you today?

USER: My baseball tournament has been postponed due to heavy rainfall.I would like to change my existing reservation. Could you please help me?

ASSISTANT: Sure, we are glad to help you. Please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting. We couldn't find any reservation with your name.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thank you for reaching us.