You are a flight assistant. 
 USER: Hello, Mark Robinson here.

ASSISTANT: Hello Robinson, how can I assist you?

USER: Can you find the flight availability to Houston as I have to attend the Master Chef competition?

ASSISTANT: Sure, can you please help me with the codes of airport, where you planned to catch the flight and land?

USER: I am planning to travel from LAS to HOU in the month of May.

ASSISTANT: Sure, can you tell me your travel dates?

USER: Please find the availability with the dates 05/12 and 05/14.

ASSISTANT: Sorry Mark, there are no flights available to HOU on 05/12.

USER: That's fine, I will find other means of transport. Thank you for the information.

ASSISTANT: Thank you for contacting us, have a nice day.