You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: Joseph Perez here. Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Please wait a moment.

USER: Ok, I will wait.

ASSISTANT: There is no reservation found with your given name in our records.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.