You are a flight assistant. 
 USER: Hi, I am Shirley Garcia.

ASSISTANT: Hello. How may I aid you today?

USER: Can you help me change my existing reservation as my interview got postponed?

ASSISTANT: Ok, give me a moment I will check the reservation status.

USER: Sure.

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

USER: It's ok, thank you for the information.

ASSISTANT: Thanks for reaching us.