You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to travel from PHL to SFO for a seminar, can you please reserve a flight ticket between those locations?

ASSISTANT: Sure, I will help you. When would you like to plan your journey?

USER: Thank you, my boarding is on Mar 24 and please book my return ticket on Mar 26.

ASSISTANT: May I know your name please for booking purpose?

USER: Sure, my name is Paul Brown.

ASSISTANT: Do you need a connecting flight?

USER: Yes, I would prefer single connection for my journey.

ASSISTANT: May I know your other specifications?

USER: I don't have any other specifications.

ASSISTANT: Paul Brown, no flights has been found on your planned travel dates.

USER: Oh! Sad to hear that. Anyway, I will find another alternative. Thank you for the information.

ASSISTANT: Thank you for approaching us.