You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Jack Wright here.

ASSISTANT: Can you please let me know how may I help you?

USER: Can you change my flight ticket reservation?

ASSISTANT: Sure, I can help you in changing the ticket details. Can you please give me a minute?

USER: Sure.

ASSISTANT: Sorry to inform you, there is no active reservation found with your name in our database to change the details in the ticket.

USER: That's not a problem. Thank you.

ASSISTANT: You are most welcome. Thank you for approaching us. Have a nice day.