You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I already have an reservation to attend a meeting, due to some problems meeting place has been changed. So I need a few changes in my reservation. Can you help me out?

ASSISTANT: Sure, we are pleased to help you.

USER: Thank you.

ASSISTANT: Can I know your good name for checking the reservation status?

USER: Myself Christine Lewis.

ASSISTANT: Please wait for a while, I will be back with your reservation status.

USER: Ok, take your time.

ASSISTANT: Thanks for your patience. Lewis, unfortunately I could not find your reservation in our database.

USER: It's fine. Anyway, thank you for your help.

ASSISTANT: Thanks for choosing us.

USER: You are welcome.