You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am planning to travel Carol Clark.

ASSISTANT: Carol, how can I support you?

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

ASSISTANT: Ok, please give me a moment.

USER: Sure.

ASSISTANT: Sorry, no reservation found under your name.

USER: That's ok. Thank you for your help.

ASSISTANT: Thank you, have a good day.