You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Sarah Nelson. I am planned a conduct science expo with students of my college on 10/10, so I need to go there on 10/12. Can you help me in booking a flight ticket?

ASSISTANT: Sure, may I know your airport codes please?

USER: My source is PHX and destination is PHL.

ASSISTANT: Ok, hold on for a moment.

USER: Sure.

ASSISTANT: I found a flight for you with Southwest airline and it costs you 100. Shall I proceed?

USER: You can book it.

ASSISTANT: Your ticket has been booked with 1015 flight number.

USER: Thank you for helping.

ASSISTANT: Welcome, thank you for choosing us.