You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I made a reservation earlier this week to meet my grand parents but due to weather conditions I need to change my travelling dates. Can you help me in change an existing reservation?

ASSISTANT: Sure, I will help you to change your reservation. May I know the name on which reservation is made?

USER: I am Amanda Williams.

ASSISTANT: Please wait for the moment, while I check for the reservation.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry there is no reservation is made on Amanda Williams.

USER: Ok, not an issue. Thanks for your information.

ASSISTANT: Thank you for reaching us, we hope see you again.