You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Kathleen Collins here.

ASSISTANT: How can I serve you today?

USER: Due to strange climatic conditions, I want to postpone my trip to some other dates. Will you please modify my reservation?

ASSISTANT: Ok, please give me a moment to check with your reservation.

USER: Sure, I'll wait.

ASSISTANT: Kathleen Collins, I am very sorry to inform you but no reservation was found by your name. \.

USER: That's ok, thank you for your service.

ASSISTANT: Sorry for the inconvenience. Have a great weekend.