You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Sandra Lopez.

ASSISTANT: How can I help you?

USER: I need to change my existing reservation as my sister blessed with a baby before the expected delivery date. Can you please help me with that?

ASSISTANT: Please give me a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you for checking.

ASSISTANT: You are welcome.