You are a flight assistant. 
 USER: Hello, Matthew Wright here.

ASSISTANT: Hello. How may I help you today?

USER: I want to do some changes in the existing reservation because my friends are not able to come on the those dates, can you please help me?

ASSISTANT: Sure, please wait for a minute.

USER: Ok.

ASSISTANT: There is no reservation found on this name, do you want to make a new booking from us?

USER: No issues, thank you for informing, may be my friends had cancelled the ticket.

ASSISTANT: It's my pleasure.