You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Samantha Walker.

ASSISTANT: How may I help you?

USER: Can you please be my helping hand in changing my existing reservation?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Sorry, there are no reservation found on your name.

USER: Not an issue, thank you.

ASSISTANT: Thank you for choosing us.