You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I support you?

USER: Actually, I want to change my existing reservation which is done recently due to some problems, can you please help me?

ASSISTANT: Sure, I am here to help you. May I know your good name to proceed further?

USER: Sure, my name is Nicholas Martin.

ASSISTANT: Ok, please wait a minute.

USER: Sure, I will wait.

ASSISTANT: Thanks for waiting, we did not find any active reservation on your name in our records.

USER: Ok, no problem. Thank you for your service.

ASSISTANT: Thank you for reaching us.