You are a flight assistant. 
 USER: Hi. Emily Clark here.

ASSISTANT: Hello, how can I assist you?

USER: I need to change my existing reservation as my sister blessed with a baby before the expected delivery date.

ASSISTANT: Ok, I will be happy to assist you. Sorry, there is no reservation been found on your name.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for connecting our agency.