You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I would like to change my current reservation as I have to meet my grandmother this weekend, can you help me?

ASSISTANT: Sure, I will help you with this.

USER: Thanks.

ASSISTANT: Can you please provide the name on which you've reserved the ticket previously?

USER: My name is Carolyn Young.

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

USER: Oh! That's a sad news for me. Anyways, thank you for checking.

ASSISTANT: Thank you for utilising our service.

USER: You are most welcome.