You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Elizabeth Campbell.

ASSISTANT: How can I assist you at this moment?

USER: Can you help me booking flight from PHX to DFW?

ASSISTANT: Sure, can you please share your planned dates of journey?

USER: My journey dates are 09/23 and 09/25.

ASSISTANT: Give me a moment please, let me check the best flights available on this route.

USER: Ok, I will wait for your response.

ASSISTANT: Southwest airlines is available on this route with a ticket fare of 100, shall I book your ticket?

USER: Ok, book it.

ASSISTANT: Elizabeth Campbell, your ticket is booked with flight number 1003.

USER: Thank you for booking.

ASSISTANT: Thank you, have a safe journey.