You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am planning to make a journey from PHL to SFO. Can you please make a reservation for me?

ASSISTANT: Sure, may I know the travelling dates?

USER: Sure, I want to depart on July 16 and need to return on July 18.

ASSISTANT: Do you have any connection limit?

USER: I need a flight with single connection.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: My name is Sarah Phillips.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, no flights found with your selected dates.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for opting us.