You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Margaret Clark this side, can you help me to book a ticket in direct flight for me/.

ASSISTANT: Sure, may I know your airport codes please?

USER: Nearby airport codes are LAS and IAH.

ASSISTANT: Ok, can you please provide your travelling dates?

USER: I am planning to start on 07/07 and return on 07/09.

ASSISTANT: Ok, hold on for a moment please. Let me check the best flight for you.

USER: Take your time.

ASSISTANT: Sorry Clark, there are no flights available on your requested dates. Sorry for the inconvenience provided.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Welcome.

USER: You are welcome.

ASSISTANT: Thank you for choosing us, have a good day.