You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I want to change my existing reservation, can you please help me with this?

ASSISTANT: For checking your reservation, we need your good name. Please mention it.

USER: My name is Jennifer Edwards.

ASSISTANT: Thank you. Please be online for a while. I will check your reservation status and get back to you.

USER: Ok.

ASSISTANT: I am sorry to say you that there is no reservation found under your name in our database.

USER: No problem, thank you.

ASSISTANT: Welcome Jennifer Edwards.