You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Alexander Williams.

ASSISTANT: How can I aid you?

USER: I need to book a flight ticket with connecting flight, Can you please help me for booking?

ASSISTANT: Sure. Can I know your travelling dates?

USER: I would like to travel on 10/20 to 10/22.

ASSISTANT: Please share me your airport codes.

USER: My source point is DCA to DEN.

ASSISTANT: We found a Delta airline,flight number:1007 and the price is 100.

USER: Ok, proceed for booking.

ASSISTANT: Your flight ticket has been reserved.

USER: Thanks for your information.

ASSISTANT: Thank you for reaching us.