You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Can you aid me to change my reservation due to emergency?

ASSISTANT: Sure, could I have your name please?

USER: Sharon Garcia here.

ASSISTANT: Ok, please allow me a moment.

USER: Okay.

ASSISTANT: Sorry, there is no reservation with your name in our portal to make changes further.

USER: Thank you for the help.

ASSISTANT: You are welcome, have a great day.