You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Christine Harris.

ASSISTANT: How may I help you?

USER: I would like to celebrate my friend's birthday at Philadelphia, please help me in booking a ticket.

ASSISTANT: May I know your airport codes please?

USER: My airport codes are PHL and AUS.

ASSISTANT: Can you please share your journey dates please?

USER: My journey dates are 04/28 and 04/30.

ASSISTANT: There is a flight for you in UA airlines with price 100 and. Can I book the ticket?

USER: Ok, please book my ticket.

ASSISTANT: Ok, your booking is confirmed with flight number 1013.

USER: Thank you for your assistance.

ASSISTANT: Thank you for choosing us.