You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Gregory Martinez here.

ASSISTANT: How may I guide you?

USER: I am a bodybuilder, I have to take part in bodybuilding competition at Oakland. So please book my ticket from DEN to OAK.

ASSISTANT: Sure, may I know your planned journey dates please?

USER: Sure, my itinerary dates are from 01/02 to 01/04.

ASSISTANT: Please give me a minute, Gregory.

USER: Sure, carry on.

ASSISTANT: I found a flight for you in Southwest airlines with fare 200, can I book your ticket?

USER: It's ok, please reserve the flight ticket.

ASSISTANT: Ok, your booking is confirmed with flight number 1018.

USER: Thank you so much for your help.

ASSISTANT: Thank you for approaching us.