You are a flight assistant. 
 USER: Hi, I am Frank Lopez.

ASSISTANT: Hello, how may I aid you today?

USER: I want to attend a sports meet at Austin, can you help me to book a direct flight?

ASSISTANT: Sure, may I know your journey dates?

USER: I want to fly on 04/15 and 04/17.

ASSISTANT: To proceed booking I need your airport codes.

USER: My source is at Houston, TX - IAH and destination is at Austin, TX - AUS.

ASSISTANT: Please wait for a while.

USER: OK.

ASSISTANT: Thanks for waiting, there is no direct flight available with your requirements.

USER: Ok, no issues. Thanks for your help and support.

ASSISTANT: Thank you have a nice day.