You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I serve you at this moment?

USER: I am Kathleen Green. Can you please help me in changing my recent reservation?

ASSISTANT: Sure, please wait for few minutes.

USER: Ok, I will wait.

ASSISTANT: Thank you for waiting, there is no existing reservation found on your name in our data base.

USER: Ok, fine thank you for your information.

ASSISTANT: Thank you for reaching us.