You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am looking to change the travel dates in the past ticket because the planned trip got postponed. Can you please help me to do that?

ASSISTANT: Sure, I will help you out.

USER: Thank you.

ASSISTANT: Please give me a moment.

USER: My name is Brian Robinson. Please check my ticket status with this name.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

USER: It's ok, I think the ticket is not reserved properly. Anyways thank you for checking the ticket status.

ASSISTANT: Welcome, have a nice day. Thank you for choosing us.