You are a flight assistant. 
 USER: Hello. Linda Robinson here.

ASSISTANT: Hello, what can I do for you today?

USER: I want to change my existing reservation. Could you help me?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Please wait for a few minutes.

USER: Ok, take your time.

ASSISTANT: Thanks for your time, there was no reservation found on your good name.

USER: That's ok, no problem. Thank you for helping me.

ASSISTANT: Thank you for availing our services.