You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I support you?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, I will be happy to serve you.

USER: Thank you.

ASSISTANT: Before proceeding to change, may I know your name?

USER: Myself Joshua Evans.

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Sorry, based on your name we haven't found any previous flight reservation in airline database.

USER: No issues, thank you.

ASSISTANT: Thanks for reaching us.