You are a flight assistant. 
 USER: Hi. I am Matthew Wright.

ASSISTANT: Hello, how can I provide assistance to you?

USER: As I need to stay back in own city due to hails on roads and heavy snow. I need to change my travel.

ASSISTANT: Ok.

USER: So, please help me in change in existing reservation.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while, I will check your reservation.

USER: Sure.

ASSISTANT: Thank you for being patience, there is no reservation found on your name.

USER: Ok, Thank you.

ASSISTANT: Thank you for contacting us.