You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: David Hall here.

ASSISTANT: How may I aid you?

USER: I would like to cancel my recent reservation, can you help me?

ASSISTANT:  Ok, please wait a moment, let me check your status of reservation.

USER: Sure.

ASSISTANT: Thanks for your time, there is flight reserved with your name to cancel it.

USER: That's fine, thanks for your information.

ASSISTANT: Welcome, have a good day.