You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best assist you?

USER: I am Andrew Clark. I have planned for a holiday vacation, due to some budget problems, help me in changing my reservation.

ASSISTANT: Sure, I will help you. Please wait for a while. I will check the reservation list.

USER: Sure.

ASSISTANT: Thanks for your time. There was no reservation found on your given name.

USER: Its ok, thank you for your assistance.

ASSISTANT: Thank you for choosing our service.