You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I aid you?

USER: I am Sarah Garcia. I would like to change my existing reservation, can you please help me in changing?

ASSISTANT: Sure, I will help you. Please wait a minute.

USER: Sure.

ASSISTANT: Thanks for waiting. There is no reservation on your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.