You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Brian Moore. I would like to change my existing reservation, due to continues rainfall my tennis match has been postponed. Could you please help me with reservation?

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation based on your name.

USER: Ok, no issues.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your service.