You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Larry Lewis here.

ASSISTANT: How can I help you Lewis?

USER: I want to reserve my ticket within the price limit of 500, can you please help me to book a ticket?

ASSISTANT: Please share your planned dates of trip.

USER: Sure, my planned dates of journey is from 07/19 to 07/21.

ASSISTANT: May I know your travel airport codes?

USER: Ok, my respective airports codes are from SEA to ORD.

ASSISTANT: Please wait for a while.

USER: Sure, take your time.

ASSISTANT: Flight 1005 from Southwest airlines is available with price 100 for you.

USER: Ok, please book it.

ASSISTANT: Your ticket has been confirmed successfully.

USER: Thank you for your help.

ASSISTANT: Thank you for opting us.