You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: Kenneth Lee here. I am looking for a flight ticket with price below 5000. Can you reserve the flight ticket?

ASSISTANT: Lee, I am happy to help you. Please provide me your trip dates.

USER: Ok.

ASSISTANT: Ok, please help me with your origin and destination airport codes.

USER: My preferable dates for travel are 04/16 to 04/18. My airport codes for boarding the flight are IAH to AUS.

ASSISTANT: Ok, please wait. I will check for the available flights and get back to you.

USER: Sure.

ASSISTANT: Lee, single connection flight is available with Delta airlines and the ticket fare is 100 only. Are you comfortable with this flight?

USER: Sure, I am happy with the airlines. You can reserve the flight ticket.

ASSISTANT: Lee, your ticket is booked and your flight number is 1003.

USER: Thank you.

ASSISTANT: You are welcome and happy journey.