You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I best support you today?

USER: I am looking to change the travel dates in the past ticket, can you please help me to change the ticket details?

ASSISTANT: Sure, please wait for a while. For changing, we need your good name. Please provides it.

USER: Ok, take your time. Check my ticket status with the name Kevin Roberts.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: It's ok, not a problem with that. Thank you for your valuable time.

ASSISTANT: Thank you for opting us.

USER: You are welcome.