You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: Can you aid me to change my existing reservation as my health is not fine to travel?

ASSISTANT: Sure, may I know your good name please?

USER: I am Rebecca Phillips.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found with your given name.

USER: Ok, not a problem. Thank you for the help.

ASSISTANT: Thank you for reaching us.