You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Actually my Tennis competition is postponed so that I want to change my existing reservation. Can you help me?

ASSISTANT: Sure, can you help me with your name?

USER: Yes, I am Charles Jackson.

ASSISTANT: Sorry, no reservation is found on your name.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us, have a nice day.