You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I need to change my reservation due to urgent meeting, can you help me?

ASSISTANT: Sure, I am here to help you out. Can you please share your name to check your previous reservation status?

USER: I am John Moore.

ASSISTANT: Ok, please give me a moment.

USER: Sure.

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

USER: That's ok. Thank you.

ASSISTANT: Thank you for reaching us.