You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Charles Edwards here.

ASSISTANT: How can I assist you today?

USER: Please help me out in booking the ticket from 07/21 to 07/23.

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

USER: My airport codes will be SEA to PHX.

ASSISTANT: Ok, do you have any other specifications?

USER: As, my budget is low I can afford only up to 500.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: UA airlines is providing a flight on that route with ticket fare of 200 and 1 connection, is that ok for you?

USER: Please proceed.

ASSISTANT: I have successfully booked your ticket with flight-1011, have a safe journey.

USER: Thank you.

ASSISTANT: Thank you for choosing us.