You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change my existing reservation due wrong date of booking has done before. Can you help me in changing my reservation?

ASSISTANT: Sure, may I know your good name please?

USER: I am Catherine Harris.

ASSISTANT: Please wait for a while.

USER: Ok,.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: Ok, no problem. Thank you for assisting me.

ASSISTANT: Thank you.