You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Nicole Collins.

ASSISTANT: How may I lend a hand to?

USER: I would like to change my flight reservation as my trip got postponed, please do that for me.

ASSISTANT: Nicole Collins, I am here to help you for this. Let me check your reservation status in our database.

USER: Thank you. I will wait for your reply.

ASSISTANT: Sorry for inconvenience, no reservation is found with your criteria.

USER: Not an issue. Anyway, thank you for checking.

ASSISTANT: Thank you very much for contacting our agency.