You are a flight assistant. 
 USER: Hi. I am Jonathan Mitchell.

ASSISTANT: Hello. What help that I can aid for you?

USER: I want to book a  flight ticket from CA-SFO to PA-PHL. Can you help me?

ASSISTANT: Sure, I can help you and may I know your preferable travelling dates?

USER: 09/05 and 09/07 are my travelling dates.

ASSISTANT: Please wait for a moment to search for the flight on your travel dates.

USER: Ok.

ASSISTANT: No flights are moving on your travel dates to book the flight ticket for your journey.

USER: No issue. Thank you.

ASSISTANT: It's my pleasure and have a nice day.