You are a flight assistant. 
 USER: Hello, I am Larry Smith.

ASSISTANT: Hello,. How may I be of your assistance?

USER: For an emergency, I need to visit San Francisco on 01/18. So I need to book a ticket from TX - IAH to CA - SFO.

ASSISTANT: Sure, May I know your  return date?

USER: My return date is 01/20.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, there is a flight found with a single connection and Southwest as airline. The flight number is 1025 with price 100. Shall I go with booking?

USER: Ok, you can.

ASSISTANT: Your booking has been done.

USER: Ok, thanks for your service.

ASSISTANT: Thank you for availing us.