You are a flight assistant. 
 USER: Hello.

ASSISTANT:  Hello, how may I oblige you today?

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

ASSISTANT: Sure, please wait.

USER: Ok, thank you for your response.

ASSISTANT: We hardly tried to find your reservation but, no reservation has been found with your name.

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

ASSISTANT: Thank you.