You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: Due to the sudden change in climate, I want to change my existing reservation.

ASSISTANT: Sure, can I know your name?

USER: Sure, David Garcia here.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation found on your name.

USER: Ok, no issues. Thank you for your assistance.

ASSISTANT: Thank you for reaching us.