You are a flight assistant. 
 USER: Hello. I am Sarah Thomas.

ASSISTANT: Hello, how may I aid you today?

USER: I planning to for science exhibition at Chicago, ORD. Can you please book a ticket from Houston, HOU?

ASSISTANT: Ok, could you please mention your trip dates?

USER: Travelling dates are 09/04 to 09/06.

ASSISTANT: Ok, how much do you want to spend on your ticket?

USER: Price limit is 500.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for being waiting, there is a flight found in UA airlines with a halt in between your journey. can I proceed with booking?

USER: You can proceed.

ASSISTANT: Ok, your ticket has been confirmed with flight number 1011.

USER: Thank you.

ASSISTANT: Thank you for reaching us.