You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I want to book a flight ticket from LAS to ORD. Could you help me in booking?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are from May 07 - 09.

ASSISTANT: On whose name shall I reserve flight ticket?

USER: John Clark.

ASSISTANT: Do you have any specifications?

USER: I prefer for connecting flight and return time should be in the morning.

ASSISTANT: Please wait a moment.

USER: OK.

ASSISTANT: Sorry, no flight tickets available on your journey dates.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for reaching our service.