You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Dennis Wilson here. I want to attend my neighbour's marriage, could you book my ticket from PHX to OAK?

ASSISTANT: Yes, can you tell me your dates of travel?

USER: My itinerary dates are July 16 and July 18.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: No problem, thank you.

ASSISTANT: Thank you for contacting us.