You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand?

USER: Can you please help me to make some changes in my existing reservation?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your name to check your details in our reservation list?

USER: Sure, my name is Pamela Collins.

ASSISTANT: Pamela Collins, please wait a moment.

USER: Sure, take your time.

ASSISTANT: Thank you for your time, we are sorry to inform you that there is no reservation available on your name to proceed further.

USER: No worries, thank you anyway.

ASSISTANT: Thank you for reaching us.