You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Myself Brenda Williams from Dallas. I want to change my travel dates in my previous reservation. Can you please help me with that?

ASSISTANT: Sure, I am here to help you out with that.

USER: Thank you for your positive response.

ASSISTANT: Please give me a moment to check your previous reservation.

USER: Ok.

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

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

ASSISTANT: Thank you for reaching us.