You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: Ok, sure. Please wait.

USER: Ok, thank you for your response.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: Oh! It's ok no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.