You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you help me to change my reservation which I had done recently?

ASSISTANT: Sure, may I know your name?

USER: Ok, please check for the name Laura Mitchell.

ASSISTANT: Please wait a moment I will check the reservation and get back to you.

USER: Ok, take your time.

ASSISTANT: Sorry, I did not find any reservation by your name in our database.

USER: That is ok, thank you for the help.

ASSISTANT: Thanks for reaching us.