You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: George Hall here.

ASSISTANT: How may I help you?

USER: I want to travel from PHX to LAS for business conference, can you please help me out with booking of a flight ticket on those locations?

ASSISTANT: Sure, may I know your trip dates?

USER: Ok, my departure is on 06/13 and please book my return ticket also on 06/15.

ASSISTANT: Ok, please wait a minute.

USER: Sure, take your time.

ASSISTANT: Sorry to inform that but there is no flights available.

USER: Oh! Sad to hear that. Anyway, thank you for the information.

ASSISTANT: Most welcome.