You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to change my recent reservation. Please help me out with that.

ASSISTANT: Sure, please wait a minute. May I know your name?

USER: My name is Jack Smith.

ASSISTANT: Soory, with your name there is no flights available.

USER: It's ok, thank you.

ASSISTANT: Welcome.