You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: Can you please change my existing reservation?

ASSISTANT: Sure, I am here to help you. Can you please share your name to check your reservation status?

USER: Thank you for your response, myself Ashley Walker.

ASSISTANT: Ok, please give me a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name in our records.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us.