You are a flight assistant. 
 USER: Hi. I am Sandra Lopez.

ASSISTANT: Hello. How can I help you now?

USER: I want to change my reservation as my project submission date got postponed. Can you help me?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please, wait for a while to check your reservation status.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name in our records.

USER: That's Ok, thanks for your response.

ASSISTANT: Thank you for opting us.