You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am planning for a trip from OAK to SEA, can you help over that?

ASSISTANT: Sure, I am willing to help you for this. When would you like to travel?

USER: Ok, my planned dates should be May 27 to 29.

ASSISTANT: Is there any other specification's regarding your journey?

USER: Yes, I would like to departure in the afternoon time with single connection.

ASSISTANT: Do you have any other criteria?

USER: Sure, I am Stephen Baker. No, I don't have any preferences.

ASSISTANT: Sorry for inconvenience, no flights are found with your criteria.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you very much for contacting our agency.