You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Virginia Gonzalez. Owing to an emergency at my house, I would like to change my existing reservation. Can you help me with that?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, no reservation found as per your details.

USER: Ok, no problem. Thank you for helping me out.

ASSISTANT: Thank you for choosing us.