You are a flight assistant. 
 USER: Hi, Kathleen Collins here.

ASSISTANT: Hello Kathleen Collins. How can I support you today?

USER: I need to change my existing reservation due to my change in examination center. Please, help me.

ASSISTANT: Sure, let me check and I will revert you back.

USER: Sure.

ASSISTANT: Thanks for being patient, we could not find any reservation with your name.

USER: Thanks for your information.

ASSISTANT: Thanks for connecting us.