You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I am Andrew Lewis, want to alter my recent reservation due to some emergency. Please help me out with that.

ASSISTANT: Ok, I will help you with that.

USER: Thanks.

ASSISTANT: Please wait for a minute.

USER: Sure, take your time.

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

USER: It's ok, thank you for your help.

ASSISTANT: Thank you for contacting us.