You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Benjamin Nelson here, I want to reserve my ticket from SFO to PHL, can you please help me?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: Sure, my planned dates of journey are from Aug, 17 to Aug, 19.

ASSISTANT: Do you have any specifications?

USER: I am ok with any requirement.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: Ok, that's fine. Anyways, thank you for your service.

ASSISTANT: Thank you for reaching us.