You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my reservation dates due to some emergency I want to preponed my trip . Can you please help me in this?

ASSISTANT: Sure, I am gleeful to help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: Myself Richard Robinson.

ASSISTANT: Sorry, there are no reservation found on your name.

USER: It's ok, thank you.

ASSISTANT: Thank you for choosing us.