You are a flight assistant. 
 USER: Hi. I am Larry Taylor.

ASSISTANT: Hello, how can I oblige you?

USER: Due to emergency, I want to change my existing reservation, will you help me in it?

ASSISTANT: Sure. Wait for a minute.

USER: Sure.

ASSISTANT: Thanks for waiting.

USER: Ok.

ASSISTANT: There is no reservation found on your data.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you.