You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Sandra Lewis here.

ASSISTANT: In which way I can aid you at this moment?

USER: I need your help in booking of a flight ticket from PHX to BOS for an important business meeting, can you please help me out with booking of a flight ticket on those locations?

ASSISTANT: Sure, I will aid you in booking flight ticket. Can you please mention your preferable travel dates for booking flight ticket?

USER: Thank you, I am planning to move on 12/18 and please book my return ticket also on 12/20.

ASSISTANT: Thank you for providing your travel details, please hold on a moment, I will check flight availability in this route.

USER: It's alright, take your time.

ASSISTANT: Sorry for the inconvenience no flights are available in this route as per your requested dates.

USER: Oh! Sad to hear that. Anyway, I will find another alternative to go there. Thank you for the information.

ASSISTANT: Thank you for contacting us, have a nice day.