You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, may I know your name?

USER: Samuel Hall is my name.

ASSISTANT: How may I assist you today?

USER: I want to change my existing reservation due to bad weather at my place.  Can you help me with it?

ASSISTANT: Please give me a while.

USER: Sure.

ASSISTANT: Thanks for waiting, we did not found any reservation by this name.

USER: It's ok, thank you for your response.

ASSISTANT: Thanks for picking us.