You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I want to alter my existing reservation because my project work is not yet finished. Can you help me?

ASSISTANT: Sure, I am here to help you in altering your reservation.

USER: Thanks.

ASSISTANT: Please provide your name to check the reservation status under your name.

USER: Ok, my name is Barbara Clark.

ASSISTANT: Sorry to say this, there are no active reservations under your name Clark.

USER: Ok, no problem. Thank you for helping me.

ASSISTANT: You are most welcome, thank you for reaching out here.