You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Frank Carter.

ASSISTANT: How can I assist you Frank?

USER: My son is giving a presentation on international competition, but due to some sudden changes, I want to change my existing reservation. Can you please help me?

ASSISTANT: Ok Frank, please wait a minute while I check for the status of your reservation. Thank you for waiting. There are no active reservations found with your details, Frank.

USER: Thank you.

ASSISTANT: Thank you for reaching us.