You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Sarah Collins here.

ASSISTANT: How can I assist you?

USER: Can you please check is there any flight available between SEA and DFW for my business trip?

ASSISTANT: Sure, can I know the travel dates please?

USER: Thank you for considering my request, my departure is on Sept 21 and please book my return ticket also on Sept 23.

ASSISTANT: Could you please provide the departure and return time?

USER: I would like to departure at morning time and return at evening time.

ASSISTANT: Do you have any requirements?

USER: I will prefer single connection for my journey.

ASSISTANT: Sorry, there are no flights available as per your request.

USER: Oh! Sad to hear that. Anyway, I will find another alternative to reach my location. Thank you for the information.

ASSISTANT: Thank you for approaching us.

USER: Welcome.