You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Sure, may I know your name?

USER: My name is Linda Smith.

ASSISTANT: Thanks for giving your name, there is no reservation found on your name.

USER: OK, no issues. Thanks for the help.

ASSISTANT: Ok, thanks for choosing us.