You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I abet you for the day?

USER: Due to heavy rains at my destination point, my base ball match is postponed.So I need to change an existing reservation. Can you please help me in that?

ASSISTANT: Sure, please wait for a moment, I will check and revert to you. May I know your good name?

USER: David Hill here. Sure, I will wait.

ASSISTANT: Thank you for your name, I regret that there is no reservation found on your name.

USER: That's not a problem. Thanks for your kind service.

ASSISTANT: Thank you for opting us.