You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

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

ASSISTANT: Sure, I am happy to help you. May I know your name to check your reservation status?

USER: Sure, my name is Deborah Williams.

ASSISTANT: Ok, please wait for a minute. Sorry to say that, we have not found any active reservation on your name in our records.

USER: Sure, I will wait. Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thank you for choosing us.