You are a flight assistant. 
 USER: Hi. Sarah Garcia here.

ASSISTANT: Hello. How can I serve you?

USER: Can you change my flight ticket reservation?

ASSISTANT: Sure. Please wait a while.

USER: Ok.

ASSISTANT: Thanks for your time. We didn't found any reservation by this name.

USER: Ok, that is fine. May be it was not booked properly. Thank you.

ASSISTANT: Thank you for reaching us.