You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How could I assist you today?

USER: I am Patricia Garicia. I want to change an existing reservation due to sudden change in my trip. Can you help me?

ASSISTANT: Sure, I will help you.

USER: Ok.

ASSISTANT: Please wait a while.

USER: Ok.

ASSISTANT: Thank you for waiting, no reservation was found on your name.

USER: No issue. Thank you.

ASSISTANT: Thank you for choosing us.