You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Patrick Jackson here.

ASSISTANT: How can I assist you today?

USER: Reserve a flight ticket for me that is from DFW to SFO.

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My travel dates for the journey are 07/20 to 07/22. I need a direct flight.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no direct flights available as per your request.

USER: No problem. Thank you.

ASSISTANT: Thanks for reaching us, have a great day.