You are a flight assistant. 
 USER: Hello, I am Rebecca Adams.

ASSISTANT: Hello, how may I assist you?

USER: As my plan to go for Brooklyn walking tour got postponed, I want to change my reservation. Can you please help me?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: There is no reservation on your name.

USER: It's ok, thank you for the information.

ASSISTANT: Thanks for picking us.