You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I would like to meet my client at Phoenix, can you please book my flight ticket from LAS to PHX?

ASSISTANT: Kindly assign your preferred dates of travelling?

USER: Yes, I will depart on July 29th and return back on July 31st.

ASSISTANT: Is there any another specifications on your trip, so that I can arrange like that only.

USER: I prefer for a direct flight.

ASSISTANT: May I know your name in the meanwhile?

USER: My name is Larry Thomas.

ASSISTANT: Sorry, no flight is available for you as per your requests.

USER: Sad to hear that. Anyway, thank you for checking.

ASSISTANT: Welcome Larry Thomas.