You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: As my plan to attend a film festival got postponed, I need your assistance in changing my earlier reservation. Will you assist me?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can I have your name to check the details in our reservation list?

USER: I am Margaret Walker.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform you Margaret that there is no reservation found on your name to proceed further.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching our service.