You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I want to visit San Francisco, can you please help me in reserving my ticket from DCA to SFO?

ASSISTANT: Sure, may I know the planned travel dates to check for the flight availability?

USER: Sure, my preferable dates of journey are from Nov, 05 to Nov, 07.

ASSISTANT: Please provide me the name.

USER: Sure, my name is Barbara Smith.

ASSISTANT: May I know the connection limit for this journey?

USER: Yes, I want to fly in a connecting flight.

ASSISTANT: Do you have any other specifications to be met?

USER: Yes, I want to depart at afternoon time.

ASSISTANT: Sorry, there are no flights are available for your desired intent.

USER: Ok, no problem. Anyways, thank you for your appreciable service.

ASSISTANT: Thank you for reaching us.