You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Mary King. I am a sports player, I would like to conduct a sports festival at Houston, can you help me in my booking.

ASSISTANT: Sure, please share me your travel dates.

USER: My journey dates are from 11/23 to 11/25.

ASSISTANT: Let me know your airport codes.

USER: My airport codes are from LAS to HOU.

ASSISTANT: Sorry for inconvenience, there are no flights with your requirement. Thank you.

USER: Not an issue. Thank you.