You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I want to attend my son's convocation ceremony, so please book my ticket from DEN to IAH.

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

USER: My trip dates are Aug 6 and Aug 8.

ASSISTANT: Please share me with your name please?

USER: Brian Walker here.

ASSISTANT: Do you have any other specifications please?

USER: I need a connecting flight.

ASSISTANT: Please wait for a mean while.

USER: I want to depart from DEN in the evening.

ASSISTANT: Sorry Walker, there is no flight found as per your travelling details.

USER: No problem, thank you.

ASSISTANT: You are welcome.