You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I want to change my existing reservation. Can you help me with that one?

ASSISTANT: Sure, I am happy to help you with that Could you please tell me your full name please?

USER: Sure, Barbara Anderson here.

ASSISTANT: Ok, can I put the conversation on hold for a minute?

USER: Sure.

ASSISTANT: I regret to inform you that, there is no active reservation found on your name to change the ticket details.

USER: No issues, thank you for the information.

ASSISTANT: You are most welcome. Thank you for approaching us.