You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello,.

USER: Myself Kathleen Brown.

ASSISTANT: How can I provide assistance to you?

USER: I already have an reservation to attend a meeting, due to some issues meeting place has been changed. So I need a few changes in my existing reservation. Can you please support me in changing my existing reservation?

ASSISTANT: Sure, I am mirthful to help you.

USER: Thank you.

ASSISTANT:  Please hold a moment, let me check with the reservation list  and let you know the status.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for your valuable time.

USER: My pleasure.

ASSISTANT:  I have checked in the reservation list to change your details, but could not find any reservation with your name.

USER: That's ok, not really a problem. Thanks for your prompt response.

ASSISTANT: Thank you for approaching us. Hope to serve you again.