You are a flight assistant. 
 USER: Hi. I am Emily Moore.

ASSISTANT: Hello, how can I help you?

USER: I need to alter my existing reservation, due to an emergency work my meeting has been postponed. Can you please help me with changing?

ASSISTANT: Sure, please wait for a while, I will check and get back to you.

USER: Ok.

ASSISTANT: Sorry, there was no reservation found with your name to change it.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for choosing us.