You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

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, let me know your name to check your reservation details in our database.

USER: Ok, my name is Emma Anderson.

ASSISTANT: Please wait for a while.

USER: Sure, I will wait.

ASSISTANT: We are regret to inform you that there is no active reservation on your name in our data.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thank you for reaching us.