You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I support you today?

USER: Due to heavy rain, I want to change my reservation. Can you help me?

ASSISTANT: Sure, I'll help you in change an existing reservation.

USER: Ok.

ASSISTANT: Please let me know your name to check the reservation status.

USER: Sandra Nelson here.

ASSISTANT: Thank you for waiting, I have checked in reservation list to change your ticket, but could not find any reservation with your name.

USER: No issue, Thanks for the information.

ASSISTANT: Thank you for availing us.