You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I was made a reservation earlier in this week. But I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, I will help you out. May I know your name please?

USER: My name is Christopher Thompson here.

ASSISTANT: Ok, please wait a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry, there are no reservations found.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.