You are a flight assistant. 
 USER: Hello. I am Jacob Robinson.

ASSISTANT: hello, how may I abet you?

USER: Due to typhoons, my tennis match has been postponed.So I want to change my existing reservation. Could you please help me?

ASSISTANT: Sure, I am here to help you. Please wait for a moment.

USER: Sure.

ASSISTANT: I have checked in reservation list to change your details, but could not find any reservation with your name.

USER: Ok, no issues. Thank you for your response.

ASSISTANT: Thank you for opting us, have a good day.