You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi,. How can I help you ?

USER: Daniel Lewis here, I want to change my recent reservation. Can you do it for me?

ASSISTANT: Sure just a second please.

USER: OK.

ASSISTANT: Mr Daniel Lewis I cannot find your reservation .

USER: Oh!. It's OK.

ASSISTANT: Thank you.

USER: Thank you for your time.