You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be your helping hand?

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

ASSISTANT: Sure, please share your name to check your current reservation status.

USER: I am Helen Miller.

ASSISTANT: No reservation found on your name to change.

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

ASSISTANT: Thank you.