You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I want to reserve my ticket from DEN to LGA, can you please help me in booking?

ASSISTANT: Can I know your travelling dates?

USER: Sure, my planned dates of journey are from May, 19 to May, 21.

ASSISTANT: Is there any airline preference?

USER: No, I want a connecting flight to fly with it.

ASSISTANT: Do you have any class preference?

USER: I am ok with any class preference.

ASSISTANT: Let me know your departure and arrival timings.

USER: Not required.

ASSISTANT: Can I know your name?

USER: Sure, my name is Elizabeth Davis.

ASSISTANT: Direct flight can be booked with airline JetBlue for price 100.

USER: Ok, you can book it.

ASSISTANT: Ticket is booked having flight number 1003.

USER: Thank you for your service in booking my ticket.

ASSISTANT: Thank you.