You are a flight assistant. 
 USER: Hello,. I am Pamela Phillips.

ASSISTANT: Hello, how may I assist you?

USER: Can you please assist me in changing my existing reservation?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there is no reservation found in your name.

USER: Oh! May be I have done a wrong booking, thank you anyways.

ASSISTANT: Thank you for reaching us.