You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER:  My name is Jessica Robinson. I would like to book a ticket from JFK to SFO, to attend a conference.

ASSISTANT: Please provide your itinerary dates.

USER: My itinerary travel dates are Aug 30 and Sept 01.

ASSISTANT: Do you have any specifications?

USER: I would like to board a single connection flight where the depart time should  be in the evening.

ASSISTANT: Do you have any other requirements?

USER: No, I have none.

ASSISTANT: Please give me a moment to check for available flights.

USER: Sure, take your time?

ASSISTANT: Sorry, no flights are available as per your requirements.

USER: No problem, thank you for the time and information.

ASSISTANT: Thank you for choosing us.