You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I want to reach Houston immediately with the direct flight to attend a client meeting, can you help me to book a flight ticket?

ASSISTANT: Ok, may I know your airport codes of your journey?

USER: I would like to start from Philadelphia, PA-PHL to reach Houston, TX-IAH.

ASSISTANT: Please let me know your travel dates please?

USER: My plan to start on 06/08 and I will return on 06/10.

ASSISTANT: Can you please wait a moment?

USER: Ok.

ASSISTANT: Can I know your name please?

USER: I am Nicole Harris.

ASSISTANT: Sorry, there are no flights available at this moment. Thank you for choosing our agency.

USER: Ok, no problem. Thank you.