You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change my existing reservation, as my exam got rescheduled. Please help me out.

ASSISTANT: Sure, that what I am here. May I know your good name please?

USER: I am Christine Hill.

ASSISTANT: Ok, please wait for a while.

USER: Ok, no issues. Thank you.

ASSISTANT: Unfortunately, there is no reservation found on your name.

USER: Thank you, no problem.

ASSISTANT: Thanks for connecting us, have a great day.