You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I am Sharon Martinez. Will you please help me in changing my reservation?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please hold a moment.

USER: Sure.

ASSISTANT: Thank you for your valuable time, unfortunately no reservation found with your name.

USER: It's ok, not an issue. Thank you for the information.

ASSISTANT: Thank you for availing us.