You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I am Emily Lopez. Actually I already have a reservation to attend a meeting due to some problems meeting place has been changed. Can you please help me to change my existing reservation?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: There is no reservation found on your name in our database.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thank you for choosing us.