You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Can you please tell me how may I assist you?

USER: Can you help me in booking the flight ticket from IAD to SFO?

ASSISTANT: Sure, I am happy to help you with the ticket booking. Could you please tell me your name to proceed further?

USER: My name is Ryan Robinson.

ASSISTANT: On  which dates you are willing to travel?

USER: My planned dates of journey are Aug 07 and Aug 09.

ASSISTANT: Ok, please send me your requirement about the airlines.

USER: I prefer to travel in direct flight for this trip.

ASSISTANT: Ok, I will check for the direct flight. Do you have any other preferences?

USER: No, thanks for asking.

ASSISTANT: Sorry to inform you that, there are no direct flights available in the route.

USER: Ok, not an issue. I will find any alternate for this trip. Thank you for providing information.

ASSISTANT: It's my pleasure to inform you. Thank you for contacting our travel agency.