You are a flight assistant. 
 USER: Hello, I am Gary Evans.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to attend a live concert at Houston, can you help me to book a flight ticket with single connection?

ASSISTANT: Sure, may I know your travelling dates?

USER: My plan to start on 08/06 and I will return within two days that is on 08/08.

ASSISTANT: May I know your airport codes?

USER: My source and destination points are Dallas, TX-DFW and Houston, TX-IAH.

ASSISTANT: Sorry there is no flight on your route.

USER: No issues, I'll choose any alternative to reach my destination. Thank you for your information.

ASSISTANT: Thank you.