You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to book a flight ticket in economy class, Can you help me to book a connecting flight?

ASSISTANT: Sure, I will help you. May I know your airport codes please?

USER: My source point is IAD and my destination is DEN.

ASSISTANT: Can you please share your planned travel dates?

USER: I like to travel on July 5th and return on July 7th.

ASSISTANT: May I know your name please?

USER: My name is Steven Allen.

ASSISTANT: Do you have any other specifications?

USER: As my plan I want my depart and arrival flight in morning.

ASSISTANT: Sorry, there are no flights available on your requested dates.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for choosing us.