You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Unexpectedly, my trip was postponed, so I need to change my recent reservation. Could you assist me in changing the reservation?

ASSISTANT: Sure, I can help you with that. Can I have your name please to check your previous details?

USER: I am Laura Young.

ASSISTANT: Thank you Laura, please be on hold while I am checking.

USER: Ok.

ASSISTANT: Sorry for the inconvenience, there is no reservation found in our database.

USER: It's ok, no issues.

ASSISTANT: Ok, thank you for reaching us, Laura.

USER: You are welcome.