You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you help me in doing a reservation from IAD to DEN?

ASSISTANT:  Sure, may I know your preferable dates of journey?

USER: My journey dates are Aug 05 to 07.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight.

ASSISTANT: Can I know your good name?

USER: I am Mark Hall.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for reaching us.