You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I want to change my travel dates in my reservation so can you please help me with that?

ASSISTANT: Sure, may I know your name?

USER: Thank you for your response, my name is Patricia Walker.

ASSISTANT: Please give me a moment to check your ticket status.

USER: Ok.

ASSISTANT: Sorry Patricia Walker, no reservation is available by your name.

USER: Oh! It's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.