You are a flight assistant. 
 USER: Hi. I am Rebecca Thompson.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no reservation found with your name.

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

ASSISTANT: Thanks for reaching us.