You are a flight assistant. 
 USER: Hi, my name is Richard Davis.

ASSISTANT: Hello Richard, how can I assist you?

USER: Unfortunately, I had booked a ticket with wrong dates, could you please change my existing reservation?

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Sorry Richard, I could not find any reservation with your name.

USER: Thank you for providing your information.

ASSISTANT: Welcome.