You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Patrick Hall.

ASSISTANT: How can I assist you?

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

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Sorry Patrick Hall, no reservation found on your name.

USER: Ok, no worries at all.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your response.