You are a flight assistant. 
 USER: Hi. I am Samuel Parker.

ASSISTANT: Hello, how can I abet you?

USER: I would like to change my reservation due to my personal work, help me in changing my reservation.

ASSISTANT: Sure, I can help you. Please wait a while.

USER: Sure.

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

USER: That's fine, thank you for your response.

ASSISTANT: Thank you for contacting us.