You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I want to change my recent reservation. Can you help me out?

ASSISTANT: Sure, may I know your name?

USER: I am Jeffrey Campbell.

ASSISTANT: Please wait for a while.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for contacting us.