You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I want to change my existing reservation. Can you help me in this?

ASSISTANT: Sure, let me know your good name please.

USER: I am Linda Lewis.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Thank you for your time. We didn't found any reservation according to your name.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for being with us.