You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you for today?

USER: I need to modify my travel dates in the past ticket, can you please help me with that?

ASSISTANT: Sure, can you please help me with your name to check the status of previous reservation?

USER: Yes, my name is Pamela Phillips.

ASSISTANT: Sorry, I have not find any active reservations under your name in our database Phillips.

USER: It's ok, I think the ticket is not properly booked last time. Thank you for helping me.

ASSISTANT: Yes, thank you for using our service.