You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I need to reserve a ticket from IAD to SFO, can you help me in doing that?

ASSISTANT: Sure, may I know your travel dates?

USER: My trip dates are May 28 to 30.

ASSISTANT: Do you have any connection limit?

USER: I want to travel in direct flight.

ASSISTANT: Are there any other specifications?

USER: No.

ASSISTANT: Can I know your name for booking your flight ticket?

USER: I am Andrew Johnson.

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.