You are a flight assistant. 
 USER: Hi, I am Frank Martinez.

ASSISTANT: Hello, how can I best serve you now?

USER: I need to book a flight ticket from San Francisco to Houton IAH.

ASSISTANT: Sure, may I know your journey dates?

USER: Sure, I need to fly on Oct 5 and Oct 7.

ASSISTANT: In San Francisco which airport would you like to start your journey?

USER: I need to deviate from SFO.

ASSISTANT: Ok, Do you like to go with a connecting or direct flight?

USER: I would prefer a halt.

ASSISTANT: Ok, just wait for a couple of minutes.

USER: Sure.

ASSISTANT: Sorry to specify that, there is no flight found on your requested dates.

USER: Ok, not an issue. Thank you for your assistance.

ASSISTANT: Thanks for consulting us, have a great day.