You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Paul Rodriguez. I am trying to change my travel dates in my past ticket. Can you please help me?

ASSISTANT: Sure, I will help you out in changing the reservation.

USER: Thank you.

ASSISTANT: Please give me a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry to inform you there are no reservations found on this name.

USER: It's ok, thank you for helping me.

ASSISTANT: Thank you for choosing us.