You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Can you change my recent reservation, which I have done with my name Jonathan Mitchell.

ASSISTANT: Sure, please wait for a minute.

USER: Take your time.

ASSISTANT: I could not find any reservation with your name in our database.

USER: It's ok, thanks for your information.

ASSISTANT: It's my pleasure.