You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Emma Martinez.

ASSISTANT: How may I help you at this moment?

USER: I would like to change my reservation as I am leaving for delegates meet, can you please help me out?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our database.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for reaching us.