You are a flight assistant. 
 USER: Hello. I am Kenneth Smith.

ASSISTANT: Hello, how may I serve you today?

USER: I had planned to go on a trip, but it was postponed. Can you change my recent reservation?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Sorry Kenneth Smith, we could not find any reservation on your given name.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for choosing us.