You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to change my existing reservation. Can you help me?

ASSISTANT: Sure, may I know your name please?

USER: Sure, I am Kimberly Wright.

ASSISTANT: Ok, please give me a minute.

USER: Ok, take your time.

ASSISTANT: Sorry to inform you, there is no reservation found with your name to change the details.

USER: Ok, no problem. Anyway's thank you for your help.

ASSISTANT: You are welcome. Have a nice day. Thank you for reaching us.