You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Can you help me in booking my flight ticket from BOS to DEN?

ASSISTANT: Sure, may I know the planned travel dates?

USER: My planned dates of journey are Apr 19 and Apr 21.

ASSISTANT: Please provide me the specifications.

USER: I prefer normal cost airlines for this trip.

ASSISTANT: May I know the name?

USER: My name is Samuel Jones.

ASSISTANT: Do you have any other specifications?

USER: I prefer connecting flight for this trip.

ASSISTANT: Sorry, there are no flights are available for your desired intent.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for reaching us.