You are a flight assistant. 
 USER: Hello.

ASSISTANT: How exactly can I help you?

USER: I want to change my reservation, can you please help me?

ASSISTANT: Ok, please mention your name?

USER: I am Rebecca Jackson.

ASSISTANT: Thank you. Please wait.

USER: Ok.

ASSISTANT: I regret that there is no reservation found on your name.

USER: Ok, no issue. Thank you.

ASSISTANT: Thanks for consulting us, have a nice day.