You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I want to do some changes in my existing reservation. Can you help me for that?

ASSISTANT: Sure, I am here to help you with  that. Can you please let me know your full name?

USER: My name is Kathleen Lopez.

ASSISTANT: Nice name Kathleen Lopez, can I put the conversation on hold for a while?

USER: Ok.

ASSISTANT: Sorry for the trouble which is caused to you, I haven't found any reservation on your name to change the ticket details.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome. Thank you for reaching us.

USER: Welcome.