You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Cynthia Hernandez here.

ASSISTANT: How may I help you?

USER: I was willing to change my reservation due to sudden office meeting at our headquarters, can you help me out?

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found basis on your details.

USER: Ok, no issues. Thank you for checking with my booking.

ASSISTANT: Thank you for reaching us.

USER: You are most welcome.