You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: With the name of David Garcia my sister booked a flight ticket with wrong credentials, will you cancel that flight ticket?

ASSISTANT: Wait for a while, I'll let you know the details.

USER: Ok.

ASSISTANT: David, your reservation is successfully cancelled.

USER: Thanks a lot for your help.

ASSISTANT: Most welcome, have a great day.