You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I render you at this moment?

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

ASSISTANT: Sure, may I know your good name please?

USER: Yes, I am Dorothy wright.

ASSISTANT: Ok, please wait for few minutes.

USER: Sure, I will wait.

ASSISTANT: There is no existing reservation found on your name in our records.

USER: That's fine, no problem. Thank you for your help.

ASSISTANT: Thank you for reaching us.