You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Brenda Robinson.

ASSISTANT: How may I help you? Nice to meet you Brenda.

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

ASSISTANT: Sure, I will help you with the change of flight reservation. Please wait.

USER: Thank you. Sure.

ASSISTANT: Thanks for your time. I have not found the flight reservation on your name to change it.

USER: Ok, thank you.

ASSISTANT: Thank you.