You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: Could you please help me to update my travelling dates in my existing reservation?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please mention your name to check your reservation details.

USER: I am Dennis Hernandez.

ASSISTANT: Sorry, we couldn't found any reservation by your name in our database.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for connecting us.