You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need to change my travel dates in the past ticket, can you please help me to check my ticket status and modify it?

ASSISTANT: Sure, can you please share your good name?

USER: Sure, my name is Nancy Smith.

ASSISTANT: Please wait for a while.

USER: Ok, take your time.

ASSISTANT: Sorry, no reservation found on your given name.

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

ASSISTANT: Thank you for choosing us.