You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: John Allen here.

ASSISTANT: How may I guide you?

USER: I want to meet my cousin to celebrate my birthday, could you book my ticket from OAK to JFK?

ASSISTANT: John Allen, I am here to help you for this. Could you please share me your journey dates?

USER: My itinerary dates are June 8 and June 10.

ASSISTANT: Do you prefer any airline?

USER: I am comfortable with any airlines.

ASSISTANT: At what time are you willing to depart and return?

USER: I want to return in the afternoon and I need a connecting flight.

ASSISTANT: Is there any other specifications regarding your journey?

USER: I prefer normal-cost airlines.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry for inconvenience, no flights are found with your credentials.

USER: Thank you.

ASSISTANT: Thank you very much for approaching our agency.