You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Samuel Garcia here.

ASSISTANT: Garcia, 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, please give me a moment to check your ticket status.

USER: Ok, I will wait.

ASSISTANT: Sorry, no reservation found.

USER: Anyway, thank you for the information.

ASSISTANT: Thank you for choosing us.