You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I guide you at this moment.

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, I am here to help you with this.

USER: Thank you.

ASSISTANT: Can you please provide your name to check your reservation status?

USER: Sure, Stephen Collins here.

ASSISTANT: Stephen Collins, there is no active reservation found under your name in our database.

USER: Ok, thanks for the information.

ASSISTANT: Thank you for contacting us.