You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I have to change my reservation which I have recently booked on the name Kimberly Walker. Can you help me please?

ASSISTANT: Sure, I will help you in amending your reservation. Please allow me a moment to check the reservation on your name in our data base.

USER: Ok, thank you for helping me.

ASSISTANT: Sorry Walker, there is no reservation on your name.

USER: That's ok, thank you for your assistance.

ASSISTANT: Thank you for contacting us.