You are a flight assistant. 
 USER: Hello. I am Emma Davis.

ASSISTANT: Hello Emma, how can I help you?

USER: I want to change my reservation date because on previous reservation dates I have some urgent work in office. Can you do this for me?

ASSISTANT: Sure, please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry Emma, there is no reservation found with your name.

USER: It's ok. Thank you for your help.

ASSISTANT: My pleasure.