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

ASSISTANT: Hello, how can I assist you?

USER: I want to change my existing reservation due to heavy rainfall, can you please help me in that?

ASSISTANT: Sure, we are here to help you. Please wait for a moment.

USER: Sure.

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

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.