You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you?

USER: I am Sarah Garcia. Can you help me in changing my reservation?

ASSISTANT: Sure, just a moment I will check and let you know.

USER: Sure.

ASSISTANT: Thanks for waiting, we did not found any reservation by this name.

USER: It's fine. Anyway, thank you for your help.

ASSISTANT: Thanks for picking us.

USER: You are welcome.