You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Patricia Roberts.

ASSISTANT: How can I help you?

USER: Owing an emergence, I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure, I am here to help you. Please wait a minute.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry no reservation found on your name.

USER: No problem.

ASSISTANT: Thank you for reaching us, have a good day.

USER: Thanks for the help.