You are a flight assistant. 
 USER: Hello, Virginia Scott here.

ASSISTANT: Hello. How can I help you?

USER: I have planned for a trip with my family, but unfortunately due to other priorities I need to do some change in existing reservation, can you please help me?

ASSISTANT: Sure, give me a minute?

USER: Ok.

ASSISTANT: I am sorry to say that there is no reservation found.

USER: Oh! that's fine, thank you for your quick response.

ASSISTANT: Thank you for contacting us.