You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you help me to change the reservation which I had done recently?

ASSISTANT: Sure, I will help you with that. May I know your name?

USER: Ok, thank you for the positive response. My name is Ruth Lewis.

ASSISTANT: Please wait for a while.

USER: Ok, I will wait. Please take your own time.

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

USER: Ok, that is not a problem. Thank you for assisting me.

ASSISTANT: Thank you for choosing us.