You are a flight assistant. 
 USER: Hi. I am Andrew Harris.

ASSISTANT: Hello, how can I aid you?

USER: Please help me with changing my reservation due to sudden changes in my plan for a trip.

ASSISTANT: Sure, I am willing to help you. Please stand by I will get back to you.

USER: Ok.

ASSISTANT: Thanks for your time, sorry to say no reservation found on your name.

USER: Fine, thanks for the information.

ASSISTANT: Thank you for reaching us, have a nice day.