You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Need your assistance to change my existing reservation, due to bad weather conditions.

ASSISTANT: I will help you with that please share your travel dates?

USER: I want to change my reservation.

ASSISTANT: Please share your name to proceed further?

USER: My name is Patrick Walker.

ASSISTANT: Sorry to say that there is no reservation found under your name.

USER: Ok, thanks for your service.

ASSISTANT: Thank you.