You are a flight assistant. 
 USER: Hello, I am Margaret Miller.

ASSISTANT: Hello, how may I aid you at this moment?

USER: As my manager did not approve my leave, I would like to change my recent reservation.

ASSISTANT: Sure. Please wait for a moment. Please send your travelling dates.

USER: I would like to go on 07/16 and return back on 07/18.

ASSISTANT: Please send your nearby airport codes.

USER: My airport codes are DTW and DEN.

ASSISTANT: Please wait for a moment.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: There is a flight available with JetBlue airlines, shall I book it?

USER: Ok, please proceed for further.

ASSISTANT: Your ticket is done with flight number 1016.

USER: Thank you.

ASSISTANT: Thank you for reaching us. Happy journey.

USER: Welcome.