You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I need to change the travel dates in the past ticket, can you please help me to do that?

ASSISTANT: Ok, I am here to help you with that. Can I know your good name?

USER: Thank you. My name is Paul Lee.

ASSISTANT: Please wait for a minute.

USER: Sure.

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

USER: It's ok, not a problem with that. Thank you for checking my ticket status.

ASSISTANT: Thank you for reaching us.