You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Joseph Edwards.

ASSISTANT: I am here to assist you, may I know your booking concern?

USER: I would like to take a flight on 05/18 from PHL, hope you are helping me with booking ticket.

ASSISTANT: Ok, may I know your return date and destination code?

USER: Sure, I will be returning on 05/20 from AUS.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: There are no flight available. Sorry for the inconveniences.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for availing our agency.