You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you today?

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

ASSISTANT: Sure, let me know your name to check further please?

USER: Thank you for your response, my name is Stephen Smith.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT:  Sorry, no reservation found on your given name in our database to change it.

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

ASSISTANT: Thank you for contacting us.