You are a flight assistant. 
 USER: Hi. I am Mary Campbell.

ASSISTANT: Hello, how can I help you today?

USER: I want to book a flight ticket with the single connection from Philadelphia to attend a robotic workshop in Los Angeles. Can you help me in booking?

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

USER: I need to depart on Feb 4th and I will return within two days that is on Feb 6th.

ASSISTANT: May I know your source and destination codes?

USER: My boarding and landing airport codes are PHL and LAX.

ASSISTANT: Do you need a halt in between your journey?

USER: Yes, I need a halt in between my journey.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: No issues, I'll choose any alternative to reach my destination. Thank you for your information.

ASSISTANT: Thank you for reaching us.