You are a flight assistant. 
 USER: Hello. My name is Matthew Martin.

ASSISTANT: Hello, how can I assist you for the day?

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.

USER: Thank you.

ASSISTANT: Please wait for a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, we found no reservation on your given name?

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

ASSISTANT: Thank you for reaching us.