You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what kind of service you are looking from us?

USER: I am Anna Mitchell, want to alter my recent reservation due to sudden changes in my plan. Please help me out with that.

ASSISTANT: Sure, I can do that for you. Please wait for a while, I will check your reservation status and let you know.

USER: Sure, take your time.

ASSISTANT: Anna, I did not find any reservation under your name in our database.

USER: It's ok, thank you.

ASSISTANT: You are welcome and thank you for contacting us.