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 please help me with it?

ASSISTANT: Sure, may I know your name please?

USER: My name is Helen Rodriguez.

ASSISTANT: Please be on hold.

USER: OK.

ASSISTANT: Thank you for your time. Sorry, we did not find any reservation in your name.

USER: OK, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thanks for the help.