You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Timothy White.

ASSISTANT: What can I do for you?

USER: I have to attend Artificial Intelligence Summit at Houston. Can you help me in booking a ticket?

ASSISTANT: That's nice, please provide your journey dates.

USER: The summit is going to be held in the month of July. Can you check the availability of flights on dates 07/10 and 07/12?

ASSISTANT: Could you please share your airport codes?

USER: They are ATL and IAH respectively.

ASSISTANT: Please hold on a moment.

USER: Sure.

ASSISTANT: Sorry, no flights have been found on your requested dates.

USER: That's fine, as there is much time for the summit, I will book on other day. Anyways, thank you for the information.

ASSISTANT: Thank you for choosing us.