You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Yes, can you tell me your name?

USER: Susan White here.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

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

ASSISTANT: Thank you for reaching us.