You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: 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 here to help you with that. May I know your name to check your reservation status?

USER: Thank you. Sure, my name is Jacob Nelson.

ASSISTANT: Ok, please wait for a while.

USER: Ok, I will wait.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our records.

USER: Ok, not an issue. Anyways, thank you for your service.

ASSISTANT: Thank you for opting us.