You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, can you please provide me your name?

USER: I am Larry Phillips.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Larry Phillips. I regret to inform that there is no reservation by your name.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.