You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am Richard Gonzalez. I want to change an existing reservation due to sudden change in my trip. Can you help me?

ASSISTANT: Sure, we are here to assist you. Please wait for a moment, I will check with the reservation on your name.

USER: Ok.

ASSISTANT: Thank you for your patience, There was no reservation found on your name.

USER: No issue. Thank you for the information.

ASSISTANT: Thank you for contacting us.