You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Can you please help me to change my existing reservation travel dates?

ASSISTANT: Sure, I am here to help you. May I know your name to check your reservation status?

USER: Sure, I am Andrew Martinez.

ASSISTANT: Ok, please give me a moment.

USER: Sure.

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

USER: Ok, not an issue. Thank you for checking my reservation status.

ASSISTANT: Thank you for reaching us.