You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I provide assistance to you?

USER: I had planned a trip with my friend and now they want to change it. Can you help me to change my reservation?

ASSISTANT: Sure, we are here  to help you. Could you please provide your name to check your previous reservation status?

USER: My name is Karen Garcia.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Sorry we did not find any reservation with your name.

USER: No worries. Thank you for checking it.

ASSISTANT: Thank you for availing us.