You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I abet you?

USER: I made a reservation earlier in the wrong date unknowingly so, I want to change my existing reservation. Can you help me in changing?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can I have your name to check your details in our reservation list?

USER: Sure, Helen Rodriguez is my name.

ASSISTANT: Thank you, please give me a moment.

USER: Ok, take your time.

ASSISTANT: Sorry to inform you that there is no reservation found on your name to do modification.

USER: Ok, thanks for your help.

ASSISTANT: Thank you for reaching us.