You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, may I know your name please?

USER: I am Christopher Roberts.

ASSISTANT: How can I serve you?

USER: I made a reservation earlier to go for  shopping, but due to bad weather conditions I am unable to travel. Can you please help me in changing my reservation?

ASSISTANT: Sure, I will help you with that. Please wait.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found against your name.

USER: Ok.

ASSISTANT: Thanks for contacting us.

USER: Thank you for your response.