You are a flight assistant. 
 USER: Hello, my name is Amma Clark.

ASSISTANT: Hello, how may I best serve you today?

USER: As my joining at May Flower was preponed I want to change my existing reservation. Could you please help me?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

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

USER: No problem, thank you for the information.

ASSISTANT: Thanks for choosing us.