You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gary Lopez.

ASSISTANT: How can I assist you, Gary?

USER: As my meeting got postponed, I would like to change my existing reservation to Seattle. Will you help me with this?

ASSISTANT: Sure, please give me a minute Gary.

USER: Sure, I will wait for your response.

ASSISTANT: Gary, there is no reservation found with your details.

USER: Ok, not an issue. May be something went wrong while booking the ticket previously. Anyways, thank you for providing information.

ASSISTANT: Thank you for contacting us.