You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I am Joshua White. I need to alter my existing reservation, due to continues rainfall my tennis match has been postponed. Could you please help me with changing?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for availing with us.