You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Benjamin Nelson here.

ASSISTANT: How may I abet you today?

USER: I need to attend a conference with our clients at Charlotte, can you please book a ticket from PHX to CLT?

ASSISTANT: Sure, can you please mention your travelling dates?

USER: Sure, my planned departure and return travel dates are 17th and 19th of August.

ASSISTANT: Do you need any specification?

USER: Yes, I prefer normal-cost airlines.

ASSISTANT: Sorry, there are no flight tickets available on you travelling dates?

USER: Oh! That's ok, thank you for giving the information.

ASSISTANT: Thank you for reaching our service.